Question

what are the units for potential difference? a. joules per second b. ohms c. volts d. coulombs per second

Explanation:

• Option A: Joules per second is the unit for power ($P=\frac{W}{t}$, where $W$ is in joules and $t$ is in seconds).
• Option B: Ohms is the unit for electrical resistance ($R$), defined by Ohm's law $R = \frac{V}{I}$.
• Option C: By definition, the unit for potential difference ($V$) is volts. Potential difference is also related to work done ($W$) and charge ($Q$) as $V=\frac{W}{Q}$, and when $W$ is in joules and $Q$ is in coulombs, the unit of $V$ is volts.
• Option D: Coulombs per second is the unit for electric current ($I=\frac{Q}{t}$, where $Q$ is in coulombs and $t$ is in seconds).

Answer:

C. Volts