5. How many kilowatt-hours of energy would be used by a 40 W bulb that runs for 10 hours every day during the course of one year

Question

5. How many kilowatt-hours of energy would be used by a 40 W bulb that runs for 10 hours every

day during the course of one year?

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Kim Chi 1 year 2021-08-29T20:29:41+00:00 1 Answers 21 views 0

Answers ( )

  1. thuthao
    0
    2021-08-29T20:31:00+00:00
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    Answer:

    E = 0.4 kWh

    Explanation:

    Given that,

    The power of a bulb, P = 40 W

    Time, t = 10 hours

    We need to find the energy used by the bulb. Let it is equal to E. So,

    [tex]E=P\times t\\\\E=40\times 10\\\\E=400\ W-h\\\\or\\\\E=0.4\ kWh[/tex]

    So, 0.4 kWh of energy would be needed.

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