electrical efficiency. electrical efficiency electrical energy consumption: the amount of electrical...
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Electrical Efficiency
Electrical Efficiency
Electrical Energy Consumption: the amount of electrical energy used
Electrical Efficiency
Electrical Efficiency: a measure of how much useful energy a device produces compared to the amount of energy it was supplied with
Electrical Efficiency
Electrical Efficiency: a measure of how much useful energy a device produces compared to the amount of energy it was supplied with
e.g. light bulbs: -100W incandescent bulb creates the same amount of light as a 25W compact fluorescent light
Electrical Efficiency
Calculating Electrical Cost: time used, energy used, and cost of each unit of electricity combine to show the cost of using any device
Electrical Efficiency
Energy Use = power use x time
E = P x t
Electrical Efficiency
Energy Use = power use x time
E = P x t
Cost to Operate = energy use x electricity price
Cost = P x t x $
Electrical Efficiency
Sample Problem: A dishwasher has a wattage of 1200W. A wash and air-dry cycle takes 2 hours. If the cost of electricity is $0.10 per kW.h, how much would it cost to use the dishwasher once a day for a month?
Given: Wattage (P) = 1200W
Electrical Efficiency
Sample Problem: A dishwasher has a wattage of 1200W. A wash and air-dry cycle takes 2 hours. If the cost of electricity is $0.10 per kW.h, how much would it cost to use the dishwasher once a day for a month?
Given: Wattage (P) = 1200W = 1.2 kW
Electrical Efficiency
Sample Problem: A dishwasher has a wattage of 1200W. A wash and air-dry cycle takes 2 hours. If the cost of electricity is $0.10 per kW.h, how much would it cost to use the dishwasher once a day for a month?
Given: Wattage (P) = 1.2 kWtime (t) = 2 h per day
Electrical Efficiency
Sample Problem: A dishwasher has a wattage of 1200W. A wash and air-dry cycle takes 2 hours. If the cost of electricity is $0.10 per kW.h, how much would it cost to use the dishwasher once a day for a month?
Given: Wattage (P) = 1.2 kWtime (t) = 2 h per day
= 60 h per month
Electrical Efficiency
Sample Problem: A dishwasher has a wattage of 1200W. A wash and air-dry cycle takes 2 hours. If the cost of electricity is $0.10 per kW.h, how much would it cost to use the dishwasher once a day for a month?
Given: Wattage (P) = 1.2 kWtime (t) = 60 h per monthprice ($) = $0.10 per kWh
Electrical Efficiency
Sample Problem: A dishwasher has a wattage of 1200W. A wash and air-dry cycle takes 2 hours. If the cost of electricity is $0.10 per kW.h, how much would it cost to use the dishwasher once a day for a month?
Given: Wattage (P) = 1.2 kWtime (t) = 60 h per monthprice ($) = $0.10 per kWh
Unknown: cost
Electrical Efficiency
Sample Problem: A dishwasher has a wattage of 1200W. A wash and air-dry cycle takes 2 hours. If the cost of electricity is $0.10 per kW.h, how much would it cost to use the dishwasher once a day for a month?
Given: Wattage (P) = 1.2 kWtime (t) = 60 h per monthprice ($) = $0.10 per kWh
Unknown: cost
Select: Cost = P x t x $
Electrical Efficiency
Given: Wattage (P) = 1.2 kWtime (t) = 60 h per monthprice ($) = $0.10 per kWh
Unknown: costSelect: Cost = P x t x $
Solve: Cost = 1.2 x 60 x 0.10
Electrical Efficiency
Given: Wattage (P) = 1.2 kWtime (t) = 60 h per monthprice ($) = $0.10 per kWh
Unknown: costSelect: Cost = P x t x $
Solve: Cost = 1.2 x 60 x 0.10= $7.20
Electrical Efficiency
Given: Wattage (P) = 1.2 kWtime (t) = 60 h per monthprice ($) = $0.10 per kWh
Unknown: costSelect: Cost = P x t x $
Solve: Cost = 1.2 x 60 x 0.10= $7.20
therefore the cost to operate a dishwasher once a day for a month is $7.20