Which formula represents electrical power?

The formula that accurately represents electrical power is P = V × I. In this formula, P denotes power measured in watts (W), V represents voltage in volts (V), and I signifies current in amperes (A). This relationship signifies that electrical power is generated when voltage is applied across a circuit and current flows; effectively, power is the product of the voltage and the current.

Understanding the significance of this formula is crucial in electrical engineering and related fields, as it allows technicians to calculate the power consumption of devices and systems. It is foundational in applications ranging from circuit analysis to the design of electrical equipment.

In contrast to the other choices provided, the formulas don't accurately describe the relation of power in an electrical context. For example, using the formula P = I / R would erroneously suggest a relationship that doesn’t apply to power, as it incorrectly implies that current can be derived from power and resistance. The formula P = V + I presents an incorrect addition of values that do not yield power. Lastly, P = R × I misrepresents the interaction of voltage, current, and resistance without establishing a direct calculation of power. Thus, P = V × I is the only formula that properly expresses electrical power.