Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Electric motor:

This text has been unreferenced on Wikipedia for a very long time. If you can't find a source, be bold and remove it!

"

where V {\displaystyle V} is input voltage, I {\displaystyle I} is input current, T {\displaystyle T} is output torque, and ω {\displaystyle \omega } is output angular velocity. It is possible to derive analytically the point of maximum efficiency. It is typically at less than 1/2 the stall torque.[citation needed]