Introduction Electrical power is an important basic topic for every Electrical Engineering student. It is used to measure how much energy is used by an electrical device or circuit. Knowing how to calculate electrical power helps you understand electrical appliances, machines, and circuits in real life. In this article, you will learn the simple formulas to calculate electrical power for DC and AC circuits, with solved examples and practice questions. What is Electrical Power? Electrical power is the rate at which electrical energy is consumed or transferred by an electrical circuit. Unit: The unit of electrical power is Watt (W). 1 kilowatt (kW) = 1000 Watts 1 megawatt (MW) = 1,000,000 Watts Basic Formula for Electrical Power For DC circuits: P = V × I Where: P = Power in Watts (W) V = Voltage in Volts (V) I = Current in Amperes (A) A simple lamp (bulb) is a common DC load For AC Single Phase circuits: P = V × I × cos(φ) Where: cos(φ) = Power factor (between 0 and 1) In AC circuits, p...