Explain the relationship between power and energy and time

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The concept is simple, but the terminology makes it a bit complicated.  P = E over t. Power is a rate of energy transfer. The confusion comes from giving its units a name. Power is measured in watts. Energy is expressed in watt-hours, meaning that it can be computed by multiplying power by time: E = Pt. A watt is defined as one joule per second. If the use of joules and seconds were more common than the use of watts and hours, then the above formulas would seem much more natural.

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