**Unformatted text preview: **interval is The instantaneous power can be written as The SI unit of power is J/s or W (Watt). For example, our usage of electricity is always expressed in units of kilowatt . hour. This is equivalent to 7.3.1. kW . h = (10 3 W) (3600 s) = 3.6 x 10 6 J = 3.6 MJ We can also express the power delivered to a body in terms of the force that acts on the body and its velocity. Thus for a particle moving in one dimension we obtain In the more general case of motion in 3 dimensions the power P can be expressed as...

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