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A 714 W heating unit is designed to operate with an applied potential difference of 117...

A 714 W heating unit is designed to operate with an applied potential difference of 117 V. (a) By what percentage will its heat output drop if the applied potential difference drops to 112 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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