One Volt is equal to how many Joules per Coulomb?

One Volt is equal to how many Joules per Coulomb?

• A. 1 C/s
• B. 1 J/C
• C. 1 J/s
• D. 1 V/A

Answer: (B)

Voltage is energy per unit charge, so its unit is joules per coulomb. Therefore one volt means moving one coulomb of charge involves one joule of energy, i.e., 1 J/C. The other options mix different quantities: C/s is current, J/s is power, and V/A is resistance.

Voltage is energy per unit charge, so its unit is joules per coulomb. Therefore one volt means moving one coulomb of charge involves one joule of energy, i.e., 1 J/C. The other options mix different quantities: C/s is current, J/s is power, and V/A is resistance.