How is power calculated in an electrical circuit?

Power in an electrical circuit is calculated using the relationship between voltage (V), current (I), and power (P). The formula P = V × I accurately connects these three elements, indicating that power is the product of voltage and current.

When voltage is applied across a circuit, it causes current to flow. This flow of current, when multiplied by the voltage, indicates the rate at which electrical energy is converted into another form of energy, such as heat or light. Essentially, power represents the amount of energy transferred or converted per unit of time.

Thus, P = V × I provides a clear framework for calculating power in both direct current (DC) and alternating current (AC) circuits, making it a fundamental concept in electrical engineering and electronics. Understanding this equation is crucial for solving various electrical engineering problems and speaking about energy usage in practical applications.