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If you have a device of 1 KW, if this device work during an hour, this device will consume 1 KWH. If the device works during 15 min, it will consume

1KW(15 min/60 min)= 1(1/4)= .25 KWH. That is you will obtain(get?) KWH on the following way: KWH = time in hours X KW

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