What is the formula to calculate power in a resistive circuit?

In a resistive circuit, power is calculated using the formula that relates voltage and current. The relationship is defined as the product of voltage and current, which is expressed mathematically as Power (P) = Voltage (V) x Current (I). This formula stems from Ohm's Law, which states that voltage is equal to current multiplied by resistance (V = I x R). When rearranging this foundational principle, the power consumed in a circuit can be determined effectively using the voltage applied and the current flowing through the circuit.

This formula works for resistive components where energy is dissipated as heat, and the calculation provides the amount of energy used per unit time, measured in watts. Understanding this relationship is fundamental for analyzing and designing electrical circuits, ensuring that components are rated appropriately for the power they will handle.