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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