Question

Volt (V) is equal to:

• A. \( \mathrm{C/J} \)
• B. \( \mathrm{J/C} \)
• C. \( \mathrm{J/A} \)
• D. \( \mathrm{A/J} \)

Hint:

Remember: Voltage = Energy per charge. So, Volt = Joule/Coulomb (\( \mathrm{J/C} \)).

Answer 1

The Correct Option is B

Concept: Electric potential (Voltage) is defined as the work done per unit charge in moving a test charge between two points in an electric field. Mathematically, \[ V = \frac{W}{Q} \] where,

\( V \) = potential difference (Volt)
\( W \) = work done (Joule)
\( Q \) = charge (Coulomb)
Thus, the SI unit of voltage is: \[ 1~\text{Volt} = \frac{1~\text{Joule}}{1~\text{Coulomb}} = \mathrm{J/C} \]
Step 1: Using the definition of potential difference, \[ V = \frac{\text{Work done}}{\text{Charge}} = \frac{J}{C} \] Hence, Volt is equal to Joule per Coulomb.