How can power also be expressed using voltage and current?

The relationship between power, voltage, and current is described by the equation ( P = IV ). In this formula, ( P ) represents power measured in watts (W), ( I ) indicates the current in amperes (A), and ( V ) represents the voltage in volts (V). This equation implies that power is the product of current flowing through a circuit and the voltage across that circuit.

Understanding this relationship is fundamental in electrical physics because it allows us to calculate how much electrical energy is being converted to other forms (e.g., heat or light) in a circuit component like a resistor or a light bulb. When a given amount of current flows through a device while being subjected to a voltage, the system consumes or generates energy at a rate quantified by power.

The other provided expressions, although they involve power, voltage, and current, do not correctly represent the direct relationship between these three variables in the context referred to in the question. For instance, the equations relating resistance (R), current (I), and voltage (V) are derived from Ohm's Law and are utilized under different conditions or calculations. Thus, they don't provide the same foundational concept regarding power.