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The formula for calculating power in an electrical circuit is given by the relationship that power is equal to voltage times current. This is a result of the fundamental principles of electricity, often encapsulated in Ohm's Law and the definition of electrical power.

In electrical circuits, voltage (measured in volts) represents the potential energy per unit charge, while current (measured in amperes) indicates the flow of electric charge. When these two quantities are multiplied together, they yield power (measured in watts), which quantifies the rate at which electrical energy is being used or produced in the circuit.

This relationship can be expressed mathematically as:

Power (P) = Voltage (V) × Current (I)

This formula directly shows how, in a circuit, if either the voltage increases while keeping current constant, or the current increases while keeping voltage constant, the overall power increases proportionately.

Understanding this relationship is crucial for analyzing and designing electrical circuits, as knowing how much power is consumed or generated allows for determining component ratings and ensuring safe and efficient operation of electrical systems.