The number of kilowatts used by a device in one hour. This gives you the rate at which energy is consumed.
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To measure a physical quantity correctly and need to compare it with some standard quantities. Thus a standard unit is needed to measure a quantity correctly.
You have not specified the quantity of water. You cannot measure one fifth of an unspecified quantity.
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0.6726
a kilowatt hour measures electrical usage in the home usually 600 to 1200 kwh for the average home