Your utility company charges 14 cents per kilowatt-hour of electricity. What is

Question

Your utility company charges 14 cents per kilowatt-hour of electricity. What is the daily cost of keeping lit a 100 watt light bulb for 12 hours each day ? And how much will you save in a year if you replace the bulb with an LED bulb that provides the same amount of light using only 15 watts of power? Your utility company charges 14 cents per kilowatt-hour of electricity. What is the daily cost of keeping lit a 100 watt light bulb for 12 hours each day ? And how much will you save in a year if you replace the bulb with an LED bulb that provides the same amount of light using only 15 watts of power?

Explanation / Answer

(a)

1 kilowatt hour = 14 cents

100 watt X 12 = 1200 watt hour = 1.2 kilowatt hour

1.2 kilowatt hour = 14 X 1.2 = 16.80 cents

(b) 15 watt X 12 = 180 watt hour = 0.180 kilowatt hour

0.180 kilowatt hour = 14 X 0.180 = 2.52 cents

Saving per day = 16.80 - 2.52 = 14.28

So, Saving per year = 14.28 X 365 = 5212.20 cents

                                                  = 52.12 dollars

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