1 kilowatt hour of electric energy can be used () hours for 220 V, 800 w vacuum cleaners, and () hours for 220 V, 200 W washing machines 1 kilowatt hour of electric energy can be used () hours for 220 V, 800 w vacuum cleaners, and () hours for 220 V, 200 W washing machines
1000/800=1.25h;
1000/200=5h
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