Power (Physics)

In physics, Power ( $P$ ) is the rate at which work is done (or energy is transferred) over time ( $t$ ). Recall that work is a change in energy, therefore Power is the change in energy ( $E$ ) over the change in time, or $P=\Delta{E}/\Delta{t}$ .

Power is measured in watts. One watt is equal to 1 joule per second, or $W=J/s$ .

Power can also be expressed as as the product of force ( $F$ ) and velocity ( $V$ ), or $P=FV$ , because force is energy transferred to an object (a change in energy) and velocity is the change in position over time (a change in time).