If voltage is defined as energy per charge, how is it quantified?

Voltage, or electric potential difference, quantifies how much energy is transferred per unit charge in an electric circuit. It is specifically defined as the amount of energy, measured in joules, that is provided to each coulomb of charge as it moves between two points in a circuit. This is why the correct answer involves the number of joules of energy transferred by each coulomb of charge.

In practical terms, if a voltage of 1 volt exists between two points, it means that 1 joule of energy is required to move 1 coulomb of charge between those points. This relationship underlines the fundamental concept of voltage in understanding electrical energy transfer and circuit behavior, linking energy directly to the movement of charge, which is essential for analyzing circuits and appliances.