Power

Power

Power is the rate at which work is done — energy transferred per unit time:

$P = \frac{W}{t}$

Units: Watts ($\text{W} = \text{J/s}$). One watt is one joule delivered per second.

Alternative Forms

Since $W = F \cdot d$ and $v = d/t$:

$P = F \cdot v$

Power equals force times velocity — useful for engines and motors.

Common Powers

Horsepower

1 horsepower (hp) $\approx$ 746 W. A 100 hp engine $\approx$ 74.6 kW.

Examples

Your Task

Implement power(W, t) returning power in Watts.