chapter 6 section 9 comparing energy consumption: more for your money
TRANSCRIPT
Chapter 6 Section 9
Comparing Energy Consumption More for Your
Money
HW PTG 69 p 698 1-9
bull Learning Objectivendash Calculate the energy efficiency of
electrical devices and distinguish between heat transferred by conduction convection and radiation
bull Success Criteriandash Measure and compare the energy
consumed by appliancesndash Compare the costs of operating a
variety of electrical appliances in terms of power ratings amount of time each appliance is used and billing rate
ndash Distinguish among the three ways of heat transfer
bull Do Nowndash WDYSWDYT
p 691
bull Agendandash Do Nowndash Investigation
69ndash Summary
Investigation 69
bull 1 and 2 ndash teacher demo
bull 3 and 4 ndash using a hot plate
bull 5 Repeat with heating coil
bull Record measurements and observations in log
bull Heat water to same temperature as above
bull Heat water to same temperature as above
Investigation 69
bull 6 - Calculate
bull 7 ndash in notebook
bull 8 and 9
bull Energy (J)=power (W)timestime (s)
bull E = Pt
bull Calculate costs for energy use
bull Cost = energy times price per unit of energy
Summary
bull Are energy efficient methods worth the added cost of the appliance
bull Think of some scenarios where you think it would be cheaper and some scenarios where it would not be cheaper
How does this impact the decisions of large global
corporations
HW PTG 69 p 698 1-9
bull Learning Objectivendash Calculate the energy efficiency of
electrical devices and distinguish between heat transferred by conduction convection and radiation
bull Success Criteriandash Measure and compare the energy
consumed by appliancesndash Compare the costs of operating a
variety of electrical appliances in terms of power ratings amount of time each appliance is used and billing rate
ndash Distinguish among the three ways of heat transfer
bull Do Nowndash Which
method of heating is best and why
bull Agendandash Do Nowndash Physics Talkndash Essential
Questions
Physics Talk 69
bull How do you calculate the electrical energy consumed by a device
bull Assuming it uses power at a constant rate you multiply the power of the device in kilowatts by the number of hours used
bull E=Pt
Physics Talk 69
bull What if the appliance does not use power at a constant rate
bull The device uses a kilowatt meter that takes into account the amount of power used and the amount of time
Physics Talk 69
bull What are examples of devices that use a meter
bull Your refrigerator turns on and off at different rates so it uses a meter
bull You entire house is hooked up to a meter This is how the power company charges you for electricity
Physics Talk 69
bull Do all power companies use these meters
bull No Some companies use statistical data about the appliances you have in your home and just automatically charge you the average amount
Physics Talk 69
bull How can you calculate the cost of running an electronic device
bull Cost = energy times price per unit of energy
bull Energy is measured in kilowatt-hours
bull (1000 Wh = 1 kWh)
Sample Problembull An electric coffee maker uses an average of 225 kW
bull h of energy each month If the family is charged $012kW bull h for electricity what is the average monthly cost of operating the coffee maker
bull Given ndash E = 225 kWhndash Rate = $012kWh
bull Unknownndash Cost
bull Toolndash Cost = energy times price per unit of energy
bull Solutionndash Cost = 225 kWh times $012kWhndash Cost = $270
Physics Talk 69
bull What is heat transfer
bull What are the three ways heat is transferred
bull The transmission of heat energy from a warmer substance to a cooler substance
bull Conductionbull Convectionbull Radiation
Physics Talk 69
bull What is conduction
bull The transfer of heat energy from particle to particle between substances through contact or within a substance
bull Always requires direct contact
bull Example When the heating coil touched the water molecules to heat them
Physics Talk 69
bull What is convection
bull The transfer of heat energy through the movement of air or liquid currents
bull Example When the warmer water molecules moved away from the heat and transferred their energy to colder water molecules
Physics Talk 69
bull What is radiation bull The transfer of heat energy by emission of electromagnetic radiation in all directions
bull Examples ndash When the microwaves
heat the waterndash When an object is
warmed by being in the sun
Physics Talk 69
bull Conduction convection and radiation
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-
HW PTG 69 p 698 1-9
bull Learning Objectivendash Calculate the energy efficiency of
electrical devices and distinguish between heat transferred by conduction convection and radiation
bull Success Criteriandash Measure and compare the energy
consumed by appliancesndash Compare the costs of operating a
variety of electrical appliances in terms of power ratings amount of time each appliance is used and billing rate
ndash Distinguish among the three ways of heat transfer
bull Do Nowndash WDYSWDYT
p 691
bull Agendandash Do Nowndash Investigation
69ndash Summary
Investigation 69
bull 1 and 2 ndash teacher demo
bull 3 and 4 ndash using a hot plate
bull 5 Repeat with heating coil
bull Record measurements and observations in log
bull Heat water to same temperature as above
bull Heat water to same temperature as above
Investigation 69
bull 6 - Calculate
bull 7 ndash in notebook
bull 8 and 9
bull Energy (J)=power (W)timestime (s)
bull E = Pt
bull Calculate costs for energy use
bull Cost = energy times price per unit of energy
Summary
bull Are energy efficient methods worth the added cost of the appliance
bull Think of some scenarios where you think it would be cheaper and some scenarios where it would not be cheaper
How does this impact the decisions of large global
corporations
HW PTG 69 p 698 1-9
bull Learning Objectivendash Calculate the energy efficiency of
electrical devices and distinguish between heat transferred by conduction convection and radiation
bull Success Criteriandash Measure and compare the energy
consumed by appliancesndash Compare the costs of operating a
variety of electrical appliances in terms of power ratings amount of time each appliance is used and billing rate
ndash Distinguish among the three ways of heat transfer
bull Do Nowndash Which
method of heating is best and why
bull Agendandash Do Nowndash Physics Talkndash Essential
Questions
Physics Talk 69
bull How do you calculate the electrical energy consumed by a device
bull Assuming it uses power at a constant rate you multiply the power of the device in kilowatts by the number of hours used
bull E=Pt
Physics Talk 69
bull What if the appliance does not use power at a constant rate
bull The device uses a kilowatt meter that takes into account the amount of power used and the amount of time
Physics Talk 69
bull What are examples of devices that use a meter
bull Your refrigerator turns on and off at different rates so it uses a meter
bull You entire house is hooked up to a meter This is how the power company charges you for electricity
Physics Talk 69
bull Do all power companies use these meters
bull No Some companies use statistical data about the appliances you have in your home and just automatically charge you the average amount
Physics Talk 69
bull How can you calculate the cost of running an electronic device
bull Cost = energy times price per unit of energy
bull Energy is measured in kilowatt-hours
bull (1000 Wh = 1 kWh)
Sample Problembull An electric coffee maker uses an average of 225 kW
bull h of energy each month If the family is charged $012kW bull h for electricity what is the average monthly cost of operating the coffee maker
bull Given ndash E = 225 kWhndash Rate = $012kWh
bull Unknownndash Cost
bull Toolndash Cost = energy times price per unit of energy
bull Solutionndash Cost = 225 kWh times $012kWhndash Cost = $270
Physics Talk 69
bull What is heat transfer
bull What are the three ways heat is transferred
bull The transmission of heat energy from a warmer substance to a cooler substance
bull Conductionbull Convectionbull Radiation
Physics Talk 69
bull What is conduction
bull The transfer of heat energy from particle to particle between substances through contact or within a substance
bull Always requires direct contact
bull Example When the heating coil touched the water molecules to heat them
Physics Talk 69
bull What is convection
bull The transfer of heat energy through the movement of air or liquid currents
bull Example When the warmer water molecules moved away from the heat and transferred their energy to colder water molecules
Physics Talk 69
bull What is radiation bull The transfer of heat energy by emission of electromagnetic radiation in all directions
bull Examples ndash When the microwaves
heat the waterndash When an object is
warmed by being in the sun
Physics Talk 69
bull Conduction convection and radiation
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-
Investigation 69
bull 1 and 2 ndash teacher demo
bull 3 and 4 ndash using a hot plate
bull 5 Repeat with heating coil
bull Record measurements and observations in log
bull Heat water to same temperature as above
bull Heat water to same temperature as above
Investigation 69
bull 6 - Calculate
bull 7 ndash in notebook
bull 8 and 9
bull Energy (J)=power (W)timestime (s)
bull E = Pt
bull Calculate costs for energy use
bull Cost = energy times price per unit of energy
Summary
bull Are energy efficient methods worth the added cost of the appliance
bull Think of some scenarios where you think it would be cheaper and some scenarios where it would not be cheaper
How does this impact the decisions of large global
corporations
HW PTG 69 p 698 1-9
bull Learning Objectivendash Calculate the energy efficiency of
electrical devices and distinguish between heat transferred by conduction convection and radiation
bull Success Criteriandash Measure and compare the energy
consumed by appliancesndash Compare the costs of operating a
variety of electrical appliances in terms of power ratings amount of time each appliance is used and billing rate
ndash Distinguish among the three ways of heat transfer
bull Do Nowndash Which
method of heating is best and why
bull Agendandash Do Nowndash Physics Talkndash Essential
Questions
Physics Talk 69
bull How do you calculate the electrical energy consumed by a device
bull Assuming it uses power at a constant rate you multiply the power of the device in kilowatts by the number of hours used
bull E=Pt
Physics Talk 69
bull What if the appliance does not use power at a constant rate
bull The device uses a kilowatt meter that takes into account the amount of power used and the amount of time
Physics Talk 69
bull What are examples of devices that use a meter
bull Your refrigerator turns on and off at different rates so it uses a meter
bull You entire house is hooked up to a meter This is how the power company charges you for electricity
Physics Talk 69
bull Do all power companies use these meters
bull No Some companies use statistical data about the appliances you have in your home and just automatically charge you the average amount
Physics Talk 69
bull How can you calculate the cost of running an electronic device
bull Cost = energy times price per unit of energy
bull Energy is measured in kilowatt-hours
bull (1000 Wh = 1 kWh)
Sample Problembull An electric coffee maker uses an average of 225 kW
bull h of energy each month If the family is charged $012kW bull h for electricity what is the average monthly cost of operating the coffee maker
bull Given ndash E = 225 kWhndash Rate = $012kWh
bull Unknownndash Cost
bull Toolndash Cost = energy times price per unit of energy
bull Solutionndash Cost = 225 kWh times $012kWhndash Cost = $270
Physics Talk 69
bull What is heat transfer
bull What are the three ways heat is transferred
bull The transmission of heat energy from a warmer substance to a cooler substance
bull Conductionbull Convectionbull Radiation
Physics Talk 69
bull What is conduction
bull The transfer of heat energy from particle to particle between substances through contact or within a substance
bull Always requires direct contact
bull Example When the heating coil touched the water molecules to heat them
Physics Talk 69
bull What is convection
bull The transfer of heat energy through the movement of air or liquid currents
bull Example When the warmer water molecules moved away from the heat and transferred their energy to colder water molecules
Physics Talk 69
bull What is radiation bull The transfer of heat energy by emission of electromagnetic radiation in all directions
bull Examples ndash When the microwaves
heat the waterndash When an object is
warmed by being in the sun
Physics Talk 69
bull Conduction convection and radiation
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-
Investigation 69
bull 6 - Calculate
bull 7 ndash in notebook
bull 8 and 9
bull Energy (J)=power (W)timestime (s)
bull E = Pt
bull Calculate costs for energy use
bull Cost = energy times price per unit of energy
Summary
bull Are energy efficient methods worth the added cost of the appliance
bull Think of some scenarios where you think it would be cheaper and some scenarios where it would not be cheaper
How does this impact the decisions of large global
corporations
HW PTG 69 p 698 1-9
bull Learning Objectivendash Calculate the energy efficiency of
electrical devices and distinguish between heat transferred by conduction convection and radiation
bull Success Criteriandash Measure and compare the energy
consumed by appliancesndash Compare the costs of operating a
variety of electrical appliances in terms of power ratings amount of time each appliance is used and billing rate
ndash Distinguish among the three ways of heat transfer
bull Do Nowndash Which
method of heating is best and why
bull Agendandash Do Nowndash Physics Talkndash Essential
Questions
Physics Talk 69
bull How do you calculate the electrical energy consumed by a device
bull Assuming it uses power at a constant rate you multiply the power of the device in kilowatts by the number of hours used
bull E=Pt
Physics Talk 69
bull What if the appliance does not use power at a constant rate
bull The device uses a kilowatt meter that takes into account the amount of power used and the amount of time
Physics Talk 69
bull What are examples of devices that use a meter
bull Your refrigerator turns on and off at different rates so it uses a meter
bull You entire house is hooked up to a meter This is how the power company charges you for electricity
Physics Talk 69
bull Do all power companies use these meters
bull No Some companies use statistical data about the appliances you have in your home and just automatically charge you the average amount
Physics Talk 69
bull How can you calculate the cost of running an electronic device
bull Cost = energy times price per unit of energy
bull Energy is measured in kilowatt-hours
bull (1000 Wh = 1 kWh)
Sample Problembull An electric coffee maker uses an average of 225 kW
bull h of energy each month If the family is charged $012kW bull h for electricity what is the average monthly cost of operating the coffee maker
bull Given ndash E = 225 kWhndash Rate = $012kWh
bull Unknownndash Cost
bull Toolndash Cost = energy times price per unit of energy
bull Solutionndash Cost = 225 kWh times $012kWhndash Cost = $270
Physics Talk 69
bull What is heat transfer
bull What are the three ways heat is transferred
bull The transmission of heat energy from a warmer substance to a cooler substance
bull Conductionbull Convectionbull Radiation
Physics Talk 69
bull What is conduction
bull The transfer of heat energy from particle to particle between substances through contact or within a substance
bull Always requires direct contact
bull Example When the heating coil touched the water molecules to heat them
Physics Talk 69
bull What is convection
bull The transfer of heat energy through the movement of air or liquid currents
bull Example When the warmer water molecules moved away from the heat and transferred their energy to colder water molecules
Physics Talk 69
bull What is radiation bull The transfer of heat energy by emission of electromagnetic radiation in all directions
bull Examples ndash When the microwaves
heat the waterndash When an object is
warmed by being in the sun
Physics Talk 69
bull Conduction convection and radiation
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-
Summary
bull Are energy efficient methods worth the added cost of the appliance
bull Think of some scenarios where you think it would be cheaper and some scenarios where it would not be cheaper
How does this impact the decisions of large global
corporations
HW PTG 69 p 698 1-9
bull Learning Objectivendash Calculate the energy efficiency of
electrical devices and distinguish between heat transferred by conduction convection and radiation
bull Success Criteriandash Measure and compare the energy
consumed by appliancesndash Compare the costs of operating a
variety of electrical appliances in terms of power ratings amount of time each appliance is used and billing rate
ndash Distinguish among the three ways of heat transfer
bull Do Nowndash Which
method of heating is best and why
bull Agendandash Do Nowndash Physics Talkndash Essential
Questions
Physics Talk 69
bull How do you calculate the electrical energy consumed by a device
bull Assuming it uses power at a constant rate you multiply the power of the device in kilowatts by the number of hours used
bull E=Pt
Physics Talk 69
bull What if the appliance does not use power at a constant rate
bull The device uses a kilowatt meter that takes into account the amount of power used and the amount of time
Physics Talk 69
bull What are examples of devices that use a meter
bull Your refrigerator turns on and off at different rates so it uses a meter
bull You entire house is hooked up to a meter This is how the power company charges you for electricity
Physics Talk 69
bull Do all power companies use these meters
bull No Some companies use statistical data about the appliances you have in your home and just automatically charge you the average amount
Physics Talk 69
bull How can you calculate the cost of running an electronic device
bull Cost = energy times price per unit of energy
bull Energy is measured in kilowatt-hours
bull (1000 Wh = 1 kWh)
Sample Problembull An electric coffee maker uses an average of 225 kW
bull h of energy each month If the family is charged $012kW bull h for electricity what is the average monthly cost of operating the coffee maker
bull Given ndash E = 225 kWhndash Rate = $012kWh
bull Unknownndash Cost
bull Toolndash Cost = energy times price per unit of energy
bull Solutionndash Cost = 225 kWh times $012kWhndash Cost = $270
Physics Talk 69
bull What is heat transfer
bull What are the three ways heat is transferred
bull The transmission of heat energy from a warmer substance to a cooler substance
bull Conductionbull Convectionbull Radiation
Physics Talk 69
bull What is conduction
bull The transfer of heat energy from particle to particle between substances through contact or within a substance
bull Always requires direct contact
bull Example When the heating coil touched the water molecules to heat them
Physics Talk 69
bull What is convection
bull The transfer of heat energy through the movement of air or liquid currents
bull Example When the warmer water molecules moved away from the heat and transferred their energy to colder water molecules
Physics Talk 69
bull What is radiation bull The transfer of heat energy by emission of electromagnetic radiation in all directions
bull Examples ndash When the microwaves
heat the waterndash When an object is
warmed by being in the sun
Physics Talk 69
bull Conduction convection and radiation
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-
HW PTG 69 p 698 1-9
bull Learning Objectivendash Calculate the energy efficiency of
electrical devices and distinguish between heat transferred by conduction convection and radiation
bull Success Criteriandash Measure and compare the energy
consumed by appliancesndash Compare the costs of operating a
variety of electrical appliances in terms of power ratings amount of time each appliance is used and billing rate
ndash Distinguish among the three ways of heat transfer
bull Do Nowndash Which
method of heating is best and why
bull Agendandash Do Nowndash Physics Talkndash Essential
Questions
Physics Talk 69
bull How do you calculate the electrical energy consumed by a device
bull Assuming it uses power at a constant rate you multiply the power of the device in kilowatts by the number of hours used
bull E=Pt
Physics Talk 69
bull What if the appliance does not use power at a constant rate
bull The device uses a kilowatt meter that takes into account the amount of power used and the amount of time
Physics Talk 69
bull What are examples of devices that use a meter
bull Your refrigerator turns on and off at different rates so it uses a meter
bull You entire house is hooked up to a meter This is how the power company charges you for electricity
Physics Talk 69
bull Do all power companies use these meters
bull No Some companies use statistical data about the appliances you have in your home and just automatically charge you the average amount
Physics Talk 69
bull How can you calculate the cost of running an electronic device
bull Cost = energy times price per unit of energy
bull Energy is measured in kilowatt-hours
bull (1000 Wh = 1 kWh)
Sample Problembull An electric coffee maker uses an average of 225 kW
bull h of energy each month If the family is charged $012kW bull h for electricity what is the average monthly cost of operating the coffee maker
bull Given ndash E = 225 kWhndash Rate = $012kWh
bull Unknownndash Cost
bull Toolndash Cost = energy times price per unit of energy
bull Solutionndash Cost = 225 kWh times $012kWhndash Cost = $270
Physics Talk 69
bull What is heat transfer
bull What are the three ways heat is transferred
bull The transmission of heat energy from a warmer substance to a cooler substance
bull Conductionbull Convectionbull Radiation
Physics Talk 69
bull What is conduction
bull The transfer of heat energy from particle to particle between substances through contact or within a substance
bull Always requires direct contact
bull Example When the heating coil touched the water molecules to heat them
Physics Talk 69
bull What is convection
bull The transfer of heat energy through the movement of air or liquid currents
bull Example When the warmer water molecules moved away from the heat and transferred their energy to colder water molecules
Physics Talk 69
bull What is radiation bull The transfer of heat energy by emission of electromagnetic radiation in all directions
bull Examples ndash When the microwaves
heat the waterndash When an object is
warmed by being in the sun
Physics Talk 69
bull Conduction convection and radiation
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-
Physics Talk 69
bull How do you calculate the electrical energy consumed by a device
bull Assuming it uses power at a constant rate you multiply the power of the device in kilowatts by the number of hours used
bull E=Pt
Physics Talk 69
bull What if the appliance does not use power at a constant rate
bull The device uses a kilowatt meter that takes into account the amount of power used and the amount of time
Physics Talk 69
bull What are examples of devices that use a meter
bull Your refrigerator turns on and off at different rates so it uses a meter
bull You entire house is hooked up to a meter This is how the power company charges you for electricity
Physics Talk 69
bull Do all power companies use these meters
bull No Some companies use statistical data about the appliances you have in your home and just automatically charge you the average amount
Physics Talk 69
bull How can you calculate the cost of running an electronic device
bull Cost = energy times price per unit of energy
bull Energy is measured in kilowatt-hours
bull (1000 Wh = 1 kWh)
Sample Problembull An electric coffee maker uses an average of 225 kW
bull h of energy each month If the family is charged $012kW bull h for electricity what is the average monthly cost of operating the coffee maker
bull Given ndash E = 225 kWhndash Rate = $012kWh
bull Unknownndash Cost
bull Toolndash Cost = energy times price per unit of energy
bull Solutionndash Cost = 225 kWh times $012kWhndash Cost = $270
Physics Talk 69
bull What is heat transfer
bull What are the three ways heat is transferred
bull The transmission of heat energy from a warmer substance to a cooler substance
bull Conductionbull Convectionbull Radiation
Physics Talk 69
bull What is conduction
bull The transfer of heat energy from particle to particle between substances through contact or within a substance
bull Always requires direct contact
bull Example When the heating coil touched the water molecules to heat them
Physics Talk 69
bull What is convection
bull The transfer of heat energy through the movement of air or liquid currents
bull Example When the warmer water molecules moved away from the heat and transferred their energy to colder water molecules
Physics Talk 69
bull What is radiation bull The transfer of heat energy by emission of electromagnetic radiation in all directions
bull Examples ndash When the microwaves
heat the waterndash When an object is
warmed by being in the sun
Physics Talk 69
bull Conduction convection and radiation
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-
Physics Talk 69
bull What if the appliance does not use power at a constant rate
bull The device uses a kilowatt meter that takes into account the amount of power used and the amount of time
Physics Talk 69
bull What are examples of devices that use a meter
bull Your refrigerator turns on and off at different rates so it uses a meter
bull You entire house is hooked up to a meter This is how the power company charges you for electricity
Physics Talk 69
bull Do all power companies use these meters
bull No Some companies use statistical data about the appliances you have in your home and just automatically charge you the average amount
Physics Talk 69
bull How can you calculate the cost of running an electronic device
bull Cost = energy times price per unit of energy
bull Energy is measured in kilowatt-hours
bull (1000 Wh = 1 kWh)
Sample Problembull An electric coffee maker uses an average of 225 kW
bull h of energy each month If the family is charged $012kW bull h for electricity what is the average monthly cost of operating the coffee maker
bull Given ndash E = 225 kWhndash Rate = $012kWh
bull Unknownndash Cost
bull Toolndash Cost = energy times price per unit of energy
bull Solutionndash Cost = 225 kWh times $012kWhndash Cost = $270
Physics Talk 69
bull What is heat transfer
bull What are the three ways heat is transferred
bull The transmission of heat energy from a warmer substance to a cooler substance
bull Conductionbull Convectionbull Radiation
Physics Talk 69
bull What is conduction
bull The transfer of heat energy from particle to particle between substances through contact or within a substance
bull Always requires direct contact
bull Example When the heating coil touched the water molecules to heat them
Physics Talk 69
bull What is convection
bull The transfer of heat energy through the movement of air or liquid currents
bull Example When the warmer water molecules moved away from the heat and transferred their energy to colder water molecules
Physics Talk 69
bull What is radiation bull The transfer of heat energy by emission of electromagnetic radiation in all directions
bull Examples ndash When the microwaves
heat the waterndash When an object is
warmed by being in the sun
Physics Talk 69
bull Conduction convection and radiation
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-
Physics Talk 69
bull What are examples of devices that use a meter
bull Your refrigerator turns on and off at different rates so it uses a meter
bull You entire house is hooked up to a meter This is how the power company charges you for electricity
Physics Talk 69
bull Do all power companies use these meters
bull No Some companies use statistical data about the appliances you have in your home and just automatically charge you the average amount
Physics Talk 69
bull How can you calculate the cost of running an electronic device
bull Cost = energy times price per unit of energy
bull Energy is measured in kilowatt-hours
bull (1000 Wh = 1 kWh)
Sample Problembull An electric coffee maker uses an average of 225 kW
bull h of energy each month If the family is charged $012kW bull h for electricity what is the average monthly cost of operating the coffee maker
bull Given ndash E = 225 kWhndash Rate = $012kWh
bull Unknownndash Cost
bull Toolndash Cost = energy times price per unit of energy
bull Solutionndash Cost = 225 kWh times $012kWhndash Cost = $270
Physics Talk 69
bull What is heat transfer
bull What are the three ways heat is transferred
bull The transmission of heat energy from a warmer substance to a cooler substance
bull Conductionbull Convectionbull Radiation
Physics Talk 69
bull What is conduction
bull The transfer of heat energy from particle to particle between substances through contact or within a substance
bull Always requires direct contact
bull Example When the heating coil touched the water molecules to heat them
Physics Talk 69
bull What is convection
bull The transfer of heat energy through the movement of air or liquid currents
bull Example When the warmer water molecules moved away from the heat and transferred their energy to colder water molecules
Physics Talk 69
bull What is radiation bull The transfer of heat energy by emission of electromagnetic radiation in all directions
bull Examples ndash When the microwaves
heat the waterndash When an object is
warmed by being in the sun
Physics Talk 69
bull Conduction convection and radiation
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-
Physics Talk 69
bull Do all power companies use these meters
bull No Some companies use statistical data about the appliances you have in your home and just automatically charge you the average amount
Physics Talk 69
bull How can you calculate the cost of running an electronic device
bull Cost = energy times price per unit of energy
bull Energy is measured in kilowatt-hours
bull (1000 Wh = 1 kWh)
Sample Problembull An electric coffee maker uses an average of 225 kW
bull h of energy each month If the family is charged $012kW bull h for electricity what is the average monthly cost of operating the coffee maker
bull Given ndash E = 225 kWhndash Rate = $012kWh
bull Unknownndash Cost
bull Toolndash Cost = energy times price per unit of energy
bull Solutionndash Cost = 225 kWh times $012kWhndash Cost = $270
Physics Talk 69
bull What is heat transfer
bull What are the three ways heat is transferred
bull The transmission of heat energy from a warmer substance to a cooler substance
bull Conductionbull Convectionbull Radiation
Physics Talk 69
bull What is conduction
bull The transfer of heat energy from particle to particle between substances through contact or within a substance
bull Always requires direct contact
bull Example When the heating coil touched the water molecules to heat them
Physics Talk 69
bull What is convection
bull The transfer of heat energy through the movement of air or liquid currents
bull Example When the warmer water molecules moved away from the heat and transferred their energy to colder water molecules
Physics Talk 69
bull What is radiation bull The transfer of heat energy by emission of electromagnetic radiation in all directions
bull Examples ndash When the microwaves
heat the waterndash When an object is
warmed by being in the sun
Physics Talk 69
bull Conduction convection and radiation
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-
Physics Talk 69
bull How can you calculate the cost of running an electronic device
bull Cost = energy times price per unit of energy
bull Energy is measured in kilowatt-hours
bull (1000 Wh = 1 kWh)
Sample Problembull An electric coffee maker uses an average of 225 kW
bull h of energy each month If the family is charged $012kW bull h for electricity what is the average monthly cost of operating the coffee maker
bull Given ndash E = 225 kWhndash Rate = $012kWh
bull Unknownndash Cost
bull Toolndash Cost = energy times price per unit of energy
bull Solutionndash Cost = 225 kWh times $012kWhndash Cost = $270
Physics Talk 69
bull What is heat transfer
bull What are the three ways heat is transferred
bull The transmission of heat energy from a warmer substance to a cooler substance
bull Conductionbull Convectionbull Radiation
Physics Talk 69
bull What is conduction
bull The transfer of heat energy from particle to particle between substances through contact or within a substance
bull Always requires direct contact
bull Example When the heating coil touched the water molecules to heat them
Physics Talk 69
bull What is convection
bull The transfer of heat energy through the movement of air or liquid currents
bull Example When the warmer water molecules moved away from the heat and transferred their energy to colder water molecules
Physics Talk 69
bull What is radiation bull The transfer of heat energy by emission of electromagnetic radiation in all directions
bull Examples ndash When the microwaves
heat the waterndash When an object is
warmed by being in the sun
Physics Talk 69
bull Conduction convection and radiation
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-
Sample Problembull An electric coffee maker uses an average of 225 kW
bull h of energy each month If the family is charged $012kW bull h for electricity what is the average monthly cost of operating the coffee maker
bull Given ndash E = 225 kWhndash Rate = $012kWh
bull Unknownndash Cost
bull Toolndash Cost = energy times price per unit of energy
bull Solutionndash Cost = 225 kWh times $012kWhndash Cost = $270
Physics Talk 69
bull What is heat transfer
bull What are the three ways heat is transferred
bull The transmission of heat energy from a warmer substance to a cooler substance
bull Conductionbull Convectionbull Radiation
Physics Talk 69
bull What is conduction
bull The transfer of heat energy from particle to particle between substances through contact or within a substance
bull Always requires direct contact
bull Example When the heating coil touched the water molecules to heat them
Physics Talk 69
bull What is convection
bull The transfer of heat energy through the movement of air or liquid currents
bull Example When the warmer water molecules moved away from the heat and transferred their energy to colder water molecules
Physics Talk 69
bull What is radiation bull The transfer of heat energy by emission of electromagnetic radiation in all directions
bull Examples ndash When the microwaves
heat the waterndash When an object is
warmed by being in the sun
Physics Talk 69
bull Conduction convection and radiation
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-
Physics Talk 69
bull What is heat transfer
bull What are the three ways heat is transferred
bull The transmission of heat energy from a warmer substance to a cooler substance
bull Conductionbull Convectionbull Radiation
Physics Talk 69
bull What is conduction
bull The transfer of heat energy from particle to particle between substances through contact or within a substance
bull Always requires direct contact
bull Example When the heating coil touched the water molecules to heat them
Physics Talk 69
bull What is convection
bull The transfer of heat energy through the movement of air or liquid currents
bull Example When the warmer water molecules moved away from the heat and transferred their energy to colder water molecules
Physics Talk 69
bull What is radiation bull The transfer of heat energy by emission of electromagnetic radiation in all directions
bull Examples ndash When the microwaves
heat the waterndash When an object is
warmed by being in the sun
Physics Talk 69
bull Conduction convection and radiation
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-
Physics Talk 69
bull What is conduction
bull The transfer of heat energy from particle to particle between substances through contact or within a substance
bull Always requires direct contact
bull Example When the heating coil touched the water molecules to heat them
Physics Talk 69
bull What is convection
bull The transfer of heat energy through the movement of air or liquid currents
bull Example When the warmer water molecules moved away from the heat and transferred their energy to colder water molecules
Physics Talk 69
bull What is radiation bull The transfer of heat energy by emission of electromagnetic radiation in all directions
bull Examples ndash When the microwaves
heat the waterndash When an object is
warmed by being in the sun
Physics Talk 69
bull Conduction convection and radiation
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-
Physics Talk 69
bull What is convection
bull The transfer of heat energy through the movement of air or liquid currents
bull Example When the warmer water molecules moved away from the heat and transferred their energy to colder water molecules
Physics Talk 69
bull What is radiation bull The transfer of heat energy by emission of electromagnetic radiation in all directions
bull Examples ndash When the microwaves
heat the waterndash When an object is
warmed by being in the sun
Physics Talk 69
bull Conduction convection and radiation
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-
Physics Talk 69
bull What is radiation bull The transfer of heat energy by emission of electromagnetic radiation in all directions
bull Examples ndash When the microwaves
heat the waterndash When an object is
warmed by being in the sun
Physics Talk 69
bull Conduction convection and radiation
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-
Physics Talk 69
bull Conduction convection and radiation
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-
Essential Questions
bull p 696 WDYTN bull P 697 ndash What does it meanndash How do you knowndash Why do you
believendash Why should you
care
- Chapter 6 Section 9
- HW PTG 69 p 698 1-9
- Investigation 69
- Investigation 69 (2)
- Summary
- HW PTG 69 p 698 1-9 (2)
- Physics Talk 69
- Physics Talk 69 (2)
- Physics Talk 69 (3)
- Physics Talk 69 (4)
- Physics Talk 69 (5)
- Sample Problem
- Physics Talk 69 (6)
- Physics Talk 69 (7)
- Physics Talk 69 (8)
- Physics Talk 69 (9)
- Physics Talk 69 (10)
- Essential Questions
-