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

The formula for calculating power in an electrical circuit is indeed based on the relationship between voltage and current. Specifically, power is defined as the product of voltage and current, which can be mathematically represented as P = V x I.

This formula derives from the fundamental principles of electrical engineering, where power (measured in watts) is the rate at which electrical energy is consumed or produced in a circuit. Voltage (measured in volts) represents the electrical potential difference, while current (measured in amperes) quantifies the flow of electric charge. Multiplying these two quantities gives the total power being used in the circuit.

Understanding this relationship is crucial for technicians when assessing circuit performance, determining load capacities, and troubleshooting electrical systems. In contrast, the other options involve different relationships that do not correctly reflect how power is calculated. Resistance is involved in other calculations (like Ohm's law), but it is not directly multiplied by current to determine power. Likewise, simply adding or subtracting voltage and resistance does not yield a meaningful measure of power in the context of circuit analysis.