1. Energy Consumption Energy consumption is measured in kilowatt. hours. A kilowatt hour is the amount of energy being consumed per hour. –Energy (kwh) = Power (W/1000) x Time (h)

2. Consumption Question A 200 W bulb that is on for 5 hours will consume how many kwh? E = ? P = 200 W / 1000 = 0.200 kw t = 5 hours »E = P x t »E = 0.200 x 5 »E = 1 kwh

3. Another Consumption Question If a washing machine that uses 720 watts runs for 25 hours, how much energy does it use? E = ? P = 720 W / 1000 = 0.720 kw t = 25 hours »E = P x t »E = 0.720 x 25 »E = 18 kwh

4. To find the cost of electricity, multiply the energy by the price. If a kilowatt hour costs 80 cents ($0.80), how much would it cost to run a dishwasher that uses 460 watts for 6 hours? E = ? P = 460 Watts/1000 = 0.460 KW T = 6 hours E = P x t E = 0.460 x 6 E = 2.76 »Cost = 0.80 x E »Cost = 0.80 x 2.76 »Cost = $2.21