State power . State commercial unit of electrical energy . An electric heater of 400w works for 2 hours. Find the electrical energy units consumed in a day.
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Power - Power is the rate of doing work or of transferring heat, i.e. the amount of energy transferred or converted per unit time. Having no direction, it is a scalar quantity.
Commercial unit of electrical energy - Kilowatt - hour is the commercial unit of electrical energy. We have seen that power is the rate of energy consumed or delivered. If 1 joule of energy is used per second, we say that energy is used at the rate of 1 watt.
As per the question the heater is rated at 400W.
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