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Power

AP Physics 1· difficulty 2/5

A motor with 80%80\% efficiency consumes 1000 W1000~\text{W} of electrical power. Its mechanical power output is

  • A

    1000 W1000~\text{W}

  • B

    1250 W1250~\text{W}

  • C

    800 W800~\text{W}

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  • D

    200 W200~\text{W}

Explanation

Pout=η Pin=0.80×1000=800 WP_\text{out} = \eta\, P_\text{in} = 0.80 \times 1000 = 800~\text{W}.

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