Which Equation Is Used To Calculate Electric Power

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Calculated Values

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Quantity	Symbol	Value	Unit
Voltage	V	12	Volts
Current	I	5	Amperes
Resistance	R	2.4	Ohms
Power	P	60	Watts

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Explanation of Power Equations

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Electric power is the rate at which electrical energy is transferred by an electric circuit. It is commonly measured in Watts (W). There are three primary formulas used to calculate power, depending on which variables are known:

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Formula	When to Use
P = V × I	When Voltage (V) and Current (I) are known. This is the most fundamental power formula.
P = I² × R	When Current (I) and Resistance (R) are known. Useful for calculating power dissipated as heat in resistors.
P = V² / R	When Voltage (V) and Resistance (R) are known. Useful for calculating power in fixed voltage systems.

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