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21 July, 10:34

An alternative to CFL bulbs and incandescent bulbs are light-emitting diode (LED) bulbs. A 100 W incandescent bulb can be replaced by a 16 W LED bulb. Both produce 1,600 lumens of light. Assuming the cost of electricity is $0.20 per kilowatt-hour, how much does it cost (in dollars) to run the LED bulb for one year if it runs for three hours a day

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  1. 21 July, 12:09
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    cost to run the LED bulb for one year if it runs for 3 hours a day is $3.50

    Explanation:

    given data

    power = 16 W

    cost of electricity = $0.20 per kilowatt-hour

    time = 3 hours a day.

    solution

    we get here energy consumption is express as

    E = Power * time

    E = (16) * (365 * 3)

    E = 17520 Wh

    E = 17.52 kWh

    and

    cost of operation = E * cost of electricity ... 1

    cost of operation = 17.52 * $0.20

    cost of operation = $3.50

    so cost to run the LED bulb for one year if it runs for 3 hours a day is $3.50
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