What formula is used to calculate electrical power?

• A. Power (P) = Voltage (V) - Current (I)
• B. Power (P) = Voltage (V) x Current (I)
• C. Power (P) = Current (I) / Voltage (V)
• D. Power (P) = Voltage (V) + Current (I)

Answer: (B)

The formula used to calculate electrical power is given by the relationship where power (P) is equal to voltage (V) multiplied by current (I). This relationship is grounded in the fundamental principles of electricity, specifically Ohm's law and the definition of power in electrical circuits.

When an electric current flows through a circuit due to a voltage potential, the energy consumed per unit time can be quantified as power. This is expressed mathematically as P = V x I. Here, voltage represents the electrical potential that drives the current through the circuit, while current indicates the flow of electric charge. Therefore, when both voltage and current are known, multiplying them gives the total power consumed or produced within the circuit.

This formula is crucial in various applications, including determining the energy consumption of electrical devices, sizing conductors, and designing safe electrical systems. Understanding this relationship allows for effective analysis and calculations in electrical engineering and technology.