Power has the dimension length squared mass per time cubed. The SI unit of power is the watt, which is defined as a kilogram meter squared per second cubed.

Maple knows the units of power listed in the following table.

An asterisk ( * ) indicates the default context, an at sign (@) indicates an abbreviation, and under the prefixes column, SI indicates that the unit takes all SI prefixes, IEC indicates that the unit takes IEC prefixes, and SI+ and SI- indicate that the unit takes only positive and negative SI prefixes, respectively.  Refer to a unit in the Units package by indexing the name or symbol with the context, for example, watt[SI] or abW[EMU]; or, if the context is indicated as the default, by using only the unit name or symbol, for example, watt or abW.

The units of power are defined as follows.

A poncelet is defined as $100$ meters kilogramforce per second.

A donkeypower is defined as $250$ watts.

A planck power is defined as a planck length squared times planck mass per planck time cubed.

$\mathrm{convert}\left('W'\,'\mathrm{dimensions}'\,'\mathrm{base}'=\mathrm{true}\right)$

$\frac{{\mathrm{length}}^2\mathrm{mass}}{{\mathrm{time}}^3}$

$\mathrm{convert}\left(6\,'\mathrm{units}'\,'W'\,'\mathrm{hp}\left[\mathrm{UK}\right]'\right)$

$\frac{100000000000000}{12428331193037837}$

$\mathrm{convert}\left(1.0\,'\mathrm{units}'\,'\mathrm{hp}\left[\mathrm{water}\right]'\,'\mathrm{hp}\left[\mathrm{boiler}\right]'\right)$

$0.07605311178$

$\mathrm{convert}\left(342\,'\mathrm{units}'\,'\mathrm{kW}'\,'\mathrm{poncelet}'\right)$

$\frac{68400000}{196133}$