## Brake Horsepower

\[\begin{equation} \begin{aligned} 1 \: hp &= \frac{mg \Delta h}{t} \\ &= \frac{33000 \times 0.4536 \times 9.807 \times 0.3048}{60} \\ &= 746 W \end{aligned} \end{equation}\]

Today brake horsepower (bhp) is used to to measure the power output of an engine at the crankshaft just outside the engine, before the losses of power caused by the gearbox and drive train, and it is common to hear the power of a car given in terms of brake horsepower.