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27 October, 06:11

A 420 W vacuum cleaner is designed to operate 120 V. What is its resistance?

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  1. 27 October, 08:08
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    Power consumption is given by

    P=V^2/R

    So 420 = (120^2) / R

    Solving for R gives

    R = (120^2) / 420

    R = 34.29 ohms
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