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12 November, 11:48

If an appliance consumes 500 W of power and is left on for 5 hours, how much energy is used over this time period?

A. 2.5 kwh

B. 25 kwh

C. 250 kwh

D. 2500 kwh

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Answers (1)
  1. 12 November, 13:24
    0
    A. 1000 watts is 1 kilowatt

    Half of a kilowatt is 500 watts, or 0.5 of a kilowatt. 0.5 * 5 = 2.5

    Or 500 watts * 5 hours (amount of time passing) = 2500

    2500/1000 (or one kilowatt) = 2.5

    2.5 kwh is the correct option

    In summary, 1 kilowatt is 1000 watts

    500 watts is half of a kilowatt

    Every hour the appliance uses 500 watts or 0.5 (half) of a kilowatt
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