Question

an electric heater of 400w ,works on 220v what will be the resistance of heater
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Answer 1

$p = \frac{ {v}^{2} }{r} \\ 400 = \frac{220 \times 220}{r } \\ r = \frac{220 \times 220}{400} \\ r = \frac{48400}{400} \\ r = 121$

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