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24 April, 17:36

In one hour, coal supplies 500 000 J of energy. The energy amounts to 380 000 J. How much useful energy is produced in one hour?

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  1. 24 April, 21:02
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    120,000J

    Corrected question;

    In one hour, coal supplies 500 000 J of energy. The wasted energy amounts to 380 000 J. How much useful energy is produced in one hour?

    Explanation:

    Given;

    Total energy Et = 500,000 J

    Wasted Energy Ew = 380,000J

    The amount useful energy is the amount of energy that is available for supply.

    This can be derived by subtracting the wasted energy from the total energy.

    Useful energy = Total Energy - wasted energy

    Eu = Et - Ew

    Substituting the given values;

    Eu = 500,000J - 380,000

    Eu = 120,000 J

    The amount of useful energy produced in one hour is 120,000 J
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