# How to calculate Power of motor when used as a generator?

How can you calculate how much power can be generated by a motor when used as a generator (like a motor used in a wind turbine)?

Does the power depend on how fast the magnet is rotated? If so, is there a equation that lets you know given the rpm, how much power should be generated?

Also, how can I account for limiting factors such as the strength of the magnet (moving a coil around a stronger magnet should give more power than moving coil around a weaker magnet)?

• For each type of motor/generator, there are well-known equations for the torque $T$. The power $P$ is the torque $T$ multiplied by the rotational speed $\Omega$: $P=T\Omega$. Mar 25 '16 at 7:55
• @MWc You should expand on that a little and make it an answer. Mar 25 '16 at 14:02