A 100-watt lightbulb uses 1 kilowatt-hour of electrical energy when it is on for ten hours. How much energy does a 25-watt light

Question

A 100-watt lightbulb uses 1 kilowatt-hour of electrical
energy when it is on for ten hours. How much energy does
a 25-watt lightbulb use when it is on for ten hours?

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Thành Đạt 5 months 2021-08-31T06:03:42+00:00 1 Answers 1 views 0

Answers ( )

    0
    2021-08-31T06:05:40+00:00

    Answer:

    Energy = 0.25 kilowatt-hour

    Explanation:

    Given the following data;

    Power = 25 Watts

    Time = 10 hours

    Power can be defined as the energy required to do work per unit time.

    Mathematically, it is given by the formula;

     Power = \frac {Energy}{time}

    To find the energy consumed;

    Energy = power * time

    Substituting into the formula, we have;

    Energy = 25 * 10

    Energy = 250 Watt-hour

    To convert to kilowatt-hour, we would divide by 1000;

    Energy = 250/1000

    Energy = 0.25 kilowatt-hour

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