Editing Electric motor (section)

===Power===
Electric motor output power is given as <math display="block">P_\text{em} = T\omega = F v</math>where:

* <math> \omega </math>: shaft [[Angular frequency|angular speed]], [radians per second] 
* <math>T</math>: torque, [Newton-meters]
* <math>F</math>: force, [Newtons]
* <math>v</math>: velocity, [meters per second].

In [[Imperial units]] a motor's mechanical power output is given by,<ref>{{cite web|date=30 November 2011|title=DC Motor Calculations, part 1|url=http://zone.ni.com/devzone/cda/ph/p/id/46|archive-url=https://web.archive.org/web/20071012234329/http://zone.ni.com/devzone/cda/ph/p/id/46|archive-date=12 October 2007|access-date=7 December 2012|publisher=National Instruments}}</ref>

: <math>P_\text{em} = \frac {\omega_\text{rpm} T}{5252}</math> (horsepower)
where:

* <math>\omega_\text{rpm}</math>, shaft angular speed [<nowiki/>[[Revolutions per minute|rpm]]]
* <math>T</math>: torque, [foot-pounds].

In an asynchronous or induction motor, the relationship{{citation needed|date=July 2022}} between motor speed and air gap power{{clarify|reason=what is air gap power|date=July 2022}} is given by the following:

: <math>P_\text{airgap} = \frac{R_r}{s} I_r^{2}</math>, where
:: R<sub>r</sub> – rotor resistance
:: I<sub>r</sub><sup>2</sup> – square of current induced in the rotor
:: s – motor slip{{clarify|reason=what are the units of s|date=July 2022}}; i.e., difference between synchronous speed and slip speed, which provides the relative movement needed for current induction in the rotor.