Mr. Cohen is a scientist who is testing the efficiency of a 9 V battery by measuring how much electrical energy it releases. He determines t

Question

Mr. Cohen is a scientist who is testing the efficiency of a 9 V battery by measuring how much electrical energy it releases. He determines that 7 V of energy is converted to electrical energy. Which of these formulas shows how to calculate the efficiency of the battery?

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Dâu 4 years 2021-07-26T09:19:39+00:00 1 Answers 5 views 0

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  1. Nho
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    2021-07-26T09:21:01+00:00
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    Answer:

    D. (7 ÷ 9) × 100

    Explanation:

    In order to solve this problem we need the answers of the problem, performing an internet search this problem is found, with the different answer options

    A. (7 − 9) × 100

    B. (9 − 7) × 100

    C. (9 ÷ 7) × 100

    D. (7 ÷ 9) × 100

    Returning to the problem of the total energy of 9V only 7 volts were used. If we make a rule of three we realize that:

    100 = 9V\\x = 7\\x = \frac{7*100}{9} \\

    x = 77.77%

    In this way we determine that the answer is D.

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