Question: A 500 W heating unit is designed to operate with an applied potential difference of 115 V. (a) By what percentage will its heat output

A 500 W heating unit is designed to operate with an applied potential difference of 115 V.

(a) By what percentage will its heat output drop if the applied potential difference drops to 110 V? Assume no change in resistance.

(b) If you took the variation of resistance with temperature into account, would the actual drop in heat output be larger or smaller than that calculated in (a)?

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a We use P VR V2 which gives AP x AV 2V AV The percentage change is roughly APP2AVV 2110115115 8... View full answer

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