The volt is defined as energy per unit charge.

The volt is defined as energy per unit charge.

• A. Joules per Coulomb
• B. Joules per Ampere
• C. Coulombs per second
• D. Watts per Coulomb

Answer: (A)

Voltage represents how much energy is transferred per unit of charge as it moves between two points. That means the volt is the unit of energy per charge, so one volt equals one joule per coulomb. In practical terms, moving one coulomb of charge across a 1-volt potential difference involves one joule of energy. The other units don’t capture energy per charge: joules per ampere would be energy per charge flow rate (volt-seconds), not energy per single charge; coulombs per second is a measure of current, not energy; and watts per coulomb equals volt per second, not energy per charge.

Voltage represents how much energy is transferred per unit of charge as it moves between two points. That means the volt is the unit of energy per charge, so one volt equals one joule per coulomb. In practical terms, moving one coulomb of charge across a 1-volt potential difference involves one joule of energy. The other units don’t capture energy per charge: joules per ampere would be energy per charge flow rate (volt-seconds), not energy per single charge; coulombs per second is a measure of current, not energy; and watts per coulomb equals volt per second, not energy per charge.