What is the formula to calculate electrical power?

The formula to calculate electrical power is represented as P = V × I, where P stands for power in watts, V represents voltage in volts, and I denotes current in amperes. This relationship is derived from the fundamental principles of electricity, specifically Ohm's Law and the definition of power.

In electrical systems, power is essentially the rate at which energy is consumed or generated, and it can be quantified by multiplying the voltage across a circuit component by the current flowing through it. This means that if you know the voltage and the current, you can easily determine how much power is being used.

This formula is widely used in both practical applications and theoretical calculations in electrical engineering. Understanding power calculation is crucial for proper sizing of electrical components, energy management, and ensuring safety in electrical installations, thereby making it a foundational concept in the study and application of electrical and instrumentation systems.