# 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).

## Video: Power - Physics 101 / AP Physics Review

## Deeper Knowledge on Power (Physics)

### Watt's Law (Power Law)

A formula to define the relationship between power, voltage, and current (P=IV)

## Broader Topics Related to Power (Physics)

### Physics

The fundamental nature and properties of matter, energy, and motion