Two identical heaters rated $220\, volt$, $1000\, watt$ are placed in series with each other across $220 \,volt$ lines. If resistance do not change with temperature, then the combined power is ............. $watt$
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(c) Power of the combination ${P_s} = \frac{P}{n} = \frac{{1000}}{2} = 500\,W$
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