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21 November, 18:50

A 40-w lightbulb connected to a 120-v source experiences a voltage surge that produces 132 v for a moment. by what percentage does its power output increase? assume its resistance does not change. a 40-w lightbulb connected to a 120-v source experiences a voltage surge that produces 132 v for a moment. by what percentage does its power output increase? assume its resistance does not change.

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  1. 21 November, 19:19
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    R=U^2/P=120*120/40=360 ohm

    P2=U2^2/R=132*132/360=48.4 w

    power increase ratio (48.4-40) / 40=21%
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