Electric power represents the amount of electrical work done per second, and its unit is the watt [W]. If voltage is V [V] and current is I [A], then:
- For direct current (DC): P = VI [W]
- For single-phase alternating current (AC): P = VIcosθ [W]
- For three-phase alternating current (AC): P = √3 VIcosθ [W]
