electrical efficiency. electrical efficiency electrical energy consumption: the amount of electrical...

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