How is electrical power calculated in a circuit?

Electrical power in a circuit is calculated using the formula P = V × I, where P represents power measured in watts, V represents voltage measured in volts, and I represents current measured in amperes. This formula is derived from the fundamental relationship between voltage, current, and power in electrical systems, highlighting that power is the product of the voltage across a component and the current flowing through it.

This equation reflects the basic principle that electrical power gives an indication of how much energy is being used or converted per unit of time in the circuit. It is essential for understanding how electrical circuits behave and allows technicians to calculate energy consumption, assisting in the design, analysis, and optimization of electrical systems.

Understanding this relationship is vital not only for basic electrical theory but also for practical applications in HVAC systems where power consumption needs to be monitored and managed effectively. The other choices involve different relationships that do not accurately define the calculation of electrical power.