discussion | summary | practice | problems |

## power physics Summary

- Definition
- Power is the rate at which work is done (or the rate at which energy is consumed).
*non-calculus**calculus**P*=Δ *W*Δ *t**P*=*dW**dt*Where

*P*=power *W*=work *t*=time - Power is the scalar product of force and velocity
*simplified**non-calculus**calculus**P*=*F*_{∥}*v**P*=*Fv*cos θ*P*=**F**·**v**Where

*P*=power *F*_{∥}=component of force parallel to direction of motion *F*=magnitude of force **F**=force vector *v*=magnitude of velocity **v**=velocity vector θ = angle between force and velocity

- Power is the rate at which work is done (or the rate at which energy is consumed).
- Units
- The SI unit of power is the watt, named after the Scottish engineer James Watt (1736–1819).
[W = J/s = kg m

^{2}/s^{3}]

- The SI unit of power is the watt, named after the Scottish engineer James Watt (1736–1819).