The unit for measuring electrical potential difference is?

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Electrical potential difference, or voltage, is the energy available to move a unit charge between two points. The unit that expresses this is the volt, defined as one joule of energy per coulomb of charge. This is why voltage is the measure of potential difference in a circuit. The other options describe different electrical quantities: watt is power (rate of energy transfer), ampere is current (amount of charge flowing per second), and ohm is resistance (how much a component resists current).