Question: A 500-W electric heater unit is designed to operate with an applied potential difference of 120 V. (a) If the local power company imposes a

A 500-W electric heater unit is designed to operate with an applied potential difference of 120 V.
(a) If the local power company imposes a voltage reduction to lighten its load, dropping the voltage to 110 V, by what percentage does the heat output of the heater drop? (Assume the resistance does not change.)
(b) If you took the variation of resistance with temperature into account, would the actual drop in heat output be larger or smaller than calculated in part (a)?

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