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What is Power in electric circuits

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Power in electric circuit  In addition to voltage and current, there is another measure of free electron activity in a circuit: power . First, we need to understand just what power is before we analyze it in any circuits. Power is a measure of how much work can be performed in a given amount of time.  Work  is generally defined in terms of the lifting of a weight against the pull of gravity. The heavier the weight and/or the higher it is lifted, the more work has been done.  Power  is a measure of how rapidly a standard amount of work is done. For American automobiles, engine power is rated in a unit called "horsepower," invented initially as a way for steam engine manufacturers to quantify the working ability of their machines in terms of the most common power source of their day: horses. One horsepower is defined in British units as 550 ft-lbs of work per second of time. The power of a car's engine won't indicate how tall of a hill it can climb or ...