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a 1500 watt, 120vac heater is designed with a single resistive heating element. (a) what is the value of the resistance? (b) we measure the voltage of a certain wall outlet with nothing plugged into it, and verify that it is indeed 120vac. we also measure the resistance of the heater, and it's as it should be from part (a). yet when we plug in the heater, it only draws 1150 watts. explain how this could be possible. be quantitative!