Power

The rate at which electrical energy is transferred, measured in watts (W). Calculated as P = V × I (voltage times current).

concept

Power

Power (symbol: P) is the rate at which electrical energy is transferred or consumed.

Definition

Power is measured in watts (W) and represents how much energy is used per second. It’s calculated as Voltage multiplied by Current: P = V × I.

Key Points

Power = Voltage × Current
Also: Power = Current² × Resistance
Common values: 0.1W (Resistor), 1W (LED), 5W (USB device)