How is power calculated in an electrical circuit?

Power in an electrical circuit is calculated using the formula derived from Ohm’s Law, which states that Power (P) equals Voltage (V) multiplied by Current (I). This relationship is fundamental in electrical engineering and can be expressed mathematically as P = V × I.

When voltage is applied across a circuit and a current flows as a result, the power consumed by the circuit can be determined directly using this multiplication. It highlights how much energy is being used over a period of time; specifically, it measures the rate of energy transfer. Understanding this calculation is essential as it helps in analyzing circuit performance, designing electrical systems, and ensuring safety by determining appropriate power ratings for components.

The other calculations in the options do not represent how power is determined in an electrical circuit and serve different functions or concepts within electrical theory.