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22 September, 05:18

A device having a constant resistance operates at a voltage of 100 V. If the voltage supplied to the device increases by 10 percent, how does this affect the power used by the device relative to the power consumption at 100 V?

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  1. 22 September, 08:39
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    P=V^2/R

    In the first case voltage is 100V, in the second case it is 110V

    P1=10000/R

    P2=12100/R

    R=P1/10000

    R=P2/12100

    P1/10000=P2/12100

    12100. P1=P2. 10000

    Divide both by 100

    P1. 121=P2. 100

    Therefore Power in the second scenario is 21% less than the first one
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