may 21, 2012 hw: 6.2 ptg, pg. 612-613, #1-4 and vocab boxes due friday
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May 21, 2012 HW: 6.2 PTG, Pg. 612-613, #1-4 and Vocab Boxes Due Friday. LO: Use a physical model to describe the flow of electric charges in series and parallel circuits. SC: Develop a physical model for electric current and potential energy - PowerPoint PPT PresentationTRANSCRIPT
May 21, 2012HW: 6.2 PTG, Pg. 612-613, #1-4 and Vocab
Boxes Due Friday
LO: Use a physical model to
describe the flow of electric charges in series and parallel circuits.
SC: Develop a physical
model for electric current and potential energy
Use this physical model to trace the flow of electric charges in series and parallel circuits.
DO NOW: 6.1 Quiz Write LO and SC on
new left side page WDYS/WDYT-pg.
606 Investigate
Part A: vocabulary with pretzels
Ch 6 Section 2
Students assemble like picture on page 607.
Teacher = switch 1 student = battery 1 student – light bulb Rest = charges (only charged when
student has pretzel in their hand)
Part A
Round 1 Battery=energy supply=joules=pretzels Light bulb=dancing student Electric charges=coulomb=students
6230000000000000
Part A
Round 2: Battery=energy supply=joules=pretzels
“I am one VOLT, which means, I give one joule (pretzel) of energy to each coulomb (student)”
“Please move along, one coulumb (student) per second is one amp of current”
Light bulb=dancing student “I just received one joule (pretzel) of energy from
that coulomb (student) Electric charges=coulomb=students
“I just gained one joule of energy from the battery” “I just gave one joule of energy to the light bulb”
Part A
Round 3 Battery is 3 Volts Gives each coulomb 3 joules of energy
Part A
Round 4 Battery is 1 Volt Current is 2 amps=2 coulombs per second
May 22, 2012HW: 6.2 PTG, Pg. 612-613, #1-4 and Vocab
Boxes Due Friday
LO: Use a physical model to
describe the flow of electric charges in series and parallel circuits.
SC: Develop a physical
model for electric current and potential energy
Use this physical model to trace the flow of electric charges in series and parallel circuits.
DO NOW: #9 page 608: a, b,
c, d, e, f Agenda
Investigate Part B: vocabulary
with pretzels
Students answer…
#9 page 608: a, b, c, d, e, f
Part B
Series circuit 2 light bulbs, each must get some energy Battery is 1 Volt Charges have to spread their joule (pretzel) to
each light bulb equally
Students answer…
#2 a #3 a, b, c, d
#4
1V battery = 1 J of energy (pretzel) for each coulomb (student) of charge
Charges flowed at the rate of 1 amp (or 1 coulomb per second=1 student per second)
The # of Joules (pretzels) per second that a bulb receives determines how BRIGHT the bulb is
Joules per second=Power (measured in Watts) 1 Watt=1 Joule/sec Which will be brighter? A 100-W bulb or a 40-
W bulb? Why?
Students answer…
#4a: copy table at top page 609
One Bulb 2 bulbs in series Brighter?
Battery (V) Current (amps)
Battery (V) Current (amps)
1 1 1 1
1 1 2 1
1 1 1 2
1 1 2 2
2 2 4 1
2 2 2 3
4 1 3 2
Vocabulary Boxes
Potential energy Electric potential
energy Battery Resistor Coulomb Current
Voltage Volt Joule Ampere Series circuit Watt
HW: 6.2 PTG, Pg. 612-613, #1-4
LO: Use a physical model to
describe the flow of electric charges in series and parallel circuits.
SC: Develop a physical
model for electric current and potential energy
Use this physical model to trace the flow of electric charges in series and parallel circuits.
DO NOW: Find the joules per
second for a 3 volt battery, with a 5 amp current.
Investigate Part A: vocabulary
with pretzels
Physics Talk Expectations
Volume
Actions
Questions?
Finished with the slide?
Students are quiet and headphones are off
Notebooks are out and pencils are recording information from the board
Students must raise their hand to ask or answer questions.
Please wait patiently without talking or distracting your neighbor
Physics Talk 6.2
How is your bloodstream similar to an electric current?
Like blood cells, electrons carry energy to the light bulb. The energy is used up (pretzel/joule), but the electron is not (student)
Physics Talk 6.2
What is electrical potential energy?
Energy that has not get been used up and is being help by an electron or battery
Physics Talk 6.2
What is a resistor? An object in an electrical circuit that consumes energy. This object will often determine how quickly the electrons can pass by (current)
Physics Talk 6.2 An explanation of
the electron shuffle
Physics Talk 6.2
What is a series circuit?
An electrical circuit where there is only one path for the electrons to follow
The electrons move with the same current throughout the entire circuit
Physics Talk 6.2
How do we represent a series circuit?
Physics Talk
What determines the brightness of a light bulb?
The number of Watts, or Joules per second.
You can use the following equation for a series circuit (that you Ayo and Arthur)
W = Power V= Volts A= current (amperes) R = resistors, or
number of light bulbsR
AVW
Essential Questions-pg. 612
What does it mean? How do you know? Why should you care?
Vocabulary BoxesBook Definition – Your Definition - Picture
Potential energy Electric potential
energy Battery Resistor Coulomb Current
Voltage Volt Joule Ampere Series circuit Watt