5.4.1 Power (P=E/t)

Unlike its usage in English, power has a specific meaning in physics: Power is the rate of work done. It has the SI unit watt (W). 1 W is equal to 1 J per s.

If a force does W amount work in time t, then it is delivering a power of

\displaystyle P=\frac{W}{t}.

If an object gains E amount of energy in time t, then the power delivered to the object is

\displaystyle P=\frac{E}{t}

Concept Test



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