A "590-w" electric heater is designed to operate from 120-v lines. what is its operating resistance?
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Answered by skyluke89
The power used by an electrical device can be written as where V is the potential difference applied to the device and R is the electrical resistance of the device. In this problem, the power used is P=590 W and the device operates at voltage of V=120 V, therefore we can re-arrange the previous equation to calculate its resistance: