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17 October, 11:36

A tv has a power of 110 watts and an efficiency of 75 percent. how much power is wasted as heat?

A. 4.4w

B. 82.5w

C. 27.5w

D. 1.5w

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Answers (1)
  1. 17 October, 12:49
    0
    The answer is C) 27.5 W

    Explanation:

    It means that from the 110 Watts it uses 75% to do its job. Therefore we have:

    Pu = Power used = 110 * (75/100) = 82.5 watts

    82.5 watts are used for the tv work.

    And the difference between the total power and the power used is the power wasted as heat.

    (110 - 82.5) = 27.5 watts

    27.5 watts are dissipated as heat
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