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The measure of how much energy is used per unit of time in an electrical circuit is referred to as power. Power quantifies the rate at which electrical energy is consumed or generated, and it is commonly measured in watts (W).

In an electrical circuit, power is calculated using the formula P = V × I, where P represents power, V represents voltage, and I represents current. This relationship illustrates how power is a function of both the voltage applied and the current flowing through the circuit.

Understanding power is critical in both designing electrical systems and ensuring they function safely and efficiently. It helps in assessing the energy requirements of devices and how they interact within a circuit.