Exercise #1. Go get your electricity bill and see how many - TopicsExpress

Exercise #1. Go get your electricity bill and see how many kilowatt hours you used last month Exercise #2. Assume that the lights in your kitchen and living room together use 400 watts. How much does it cost if the lights are on 24 hours a day, for a whole month? How much per year? Assume 15¢/kWh. (see answer) • 400 watts x 24 hours/day x 30.5 days/month = 292,800 Total Watt-hours • 292,800 Wh / 1000 Wh = 293 kwh • 293 kWh x 15¢/kWh = $44/mo.; $528/yr. Exercise #3. Assume your window AC uses 1440 watts. How much does it cost to run it continuously for a month? How much per year? Assume 15¢/kWh. (see answer • 1440 watts x 24 hours/day x 30.5 days/monh = 1,054,080 Total Watt-hours • 1,054,080 Wh / 1000 Wh = 1,054 kWh • 1,054 kWh x 15¢/kWh = $158

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