What is the formula for calculating power in an electrical circuit?

The formula for calculating power in an electrical circuit is expressed as the product of voltage and current, which is represented by the equation Power (P) = Voltage (V) x Current (I). This relationship illustrates that power is derived from both the potential difference (voltage) pushing the current through a circuit and the actual flow of electric charge (current).

In a direct current (DC) circuit, when you multiply the voltage (in volts) by the current (in amperes), you obtain power measured in watts (W). This principle also holds true in alternating current (AC) circuits, although factors such as power factor may need to be considered for more complex calculations. Understanding this fundamental equation is essential as it forms the basis for analyzing and designing electrical systems.

Other proposed formulas do not accurately define the relationship between power, voltage, and current in a circuit. For instance, adding, dividing, or subtracting these quantities does not yield the correct calculation for electrical power, thereby emphasizing the importance of multiplication in this context.