A water heater of 3x103 ohm resistance is connected across a 200 V source. ____seconds is required to increase the temperature of one litre of water. (Specific Heat capacity of water is 4200 J/Kg.)
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Explanation:
Q=P×t
Q=mcΔT+mL
P=rms/R
4200×80+2260×103=(200)/20×t
t=1298sec
t≃22min
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