How can power also be expressed using voltage and current?

Power can indeed be expressed using voltage and current through the formula P = IV, where P represents power in watts, I symbolizes current in amperes, and V denotes voltage in volts. This relationship is derived from the definition of power, which is the rate at which energy is transferred or converted.

In an electrical circuit, when a current flows through a circuit component, the voltage across that component and the amount of current flowing define how much power is being used or generated by that component. So, when you multiply the current (I) by the voltage (V), you get the total power (P) consumed by or supplied to the circuit element.

The other formulas offered in the choices have different contexts: P = V/R relates to the relationship between power, voltage, and resistance as derived from Ohm's Law, but it doesn't directly express power in terms of voltage and current. P = I²V is an expression used in specific scenarios involving resistive loads but is not the most direct relationship for power as defined in basic circuits. P = I²R also connects power to current and resistance but is not in the direct form involving voltage as requested in the question. Thus, the most straightforward representation of power using voltage and current is P