1. Electrical Efficiency

2. Electrical Efficiency Electrical Energy Consumption: the amount of electrical energy used

3. Electrical Efficiency Electrical Efficiency: a measure of how much useful energy a device produces compared to the amount of energy it was supplied with

4. 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

5. 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

6. Electrical Efficiency Energy Use = power use x time E = P x t

7. 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 $

8. 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

9. 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

10. 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 kW time (t)= 2 h per day

11. 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 kW time (t)= 2 h per day = 60 h per month

12. 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 $0.10 per kW. h, how much would it cost to use the dishwasher once a day for a month? Given:Wattage (P) = 1.2 kW time (t) = 60 h per month price ($) = $0.10 per kWh

13. 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 $0.10 per kW. h, how much would it cost to use the dishwasher once a day for a month? Given:Wattage (P) = 1.2 kW time (t) = 60 h per month price ($) = $0.10 per kWh Unknown: cost

14. 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 $0.10 per kW. h, how much would it cost to use the dishwasher once a day for a month? Given:Wattage (P) = 1.2 kW time (t) = 60 h per month price ($) = $0.10 per kWh Unknown: cost Select: Cost = P x t x $

15. Electrical Efficiency Given:Wattage (P) = 1.2 kW time (t) = 60 h per month price ($) = $0.10 per kWh Unknown: cost Select: Cost = P x t x $ Solve: Cost= 1.2 x 60 x 0.10

16. Electrical Efficiency Given:Wattage (P) = 1.2 kW time (t) = 60 h per month price ($) = $0.10 per kWh Unknown: cost Select: Cost = P x t x $ Solve: Cost= 1.2 x 60 x 0.10 = $7.20

17. Electrical Efficiency Given:Wattage (P) = 1.2 kW time (t) = 60 h per month price ($) = $0.10 per kWh Unknown: cost Select: 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