Question

SI unit of electrical potential difference is

• A. watt
• B. volt
• C. ampere
• D. ohm

Hint:

It's important to know the SI units of basic electrical quantities: - Charge: Coulomb (C) - Current: Ampere (A) - Voltage (Potential Difference): Volt (V) - Resistance: Ohm (\( \Omega \)) - Power: Watt (W)

Answer 1

The Correct Option is B

Step 1: Recall the definition of electrical potential difference.
Electrical potential difference (voltage) is the work done per unit charge to move a charge between two points in an electric field. Step 2: Identify the SI units of the related quantities.
Work (energy) is measured in Joules (J).
Electric charge is measured in Coulombs (C).
Step 3: Determine the SI unit of electrical potential difference.
Since potential difference \( V = \frac{W}{Q} \), the SI unit of potential difference is Joules per Coulomb (J/C). This unit is given a special name: Volt (V). \[ 1 \text{ Volt (V)} = 1 \text{ Joule per Coulomb (J/C)} \] Step 4: Analyze the given options. \begin{enumerate} \item Watt (W): This is the SI unit of power (energy per unit time). \item Volt (V): This is the SI unit of electrical potential difference. \item Ampere (A): This is the SI unit of electric current (charge per unit time). \item Ohm (\( \Omega \)): This is the SI unit of electrical resistance (voltage per unit current). \end{enumerate} Step 5: Identify the correct SI unit.
The SI unit of electrical potential difference is Volt.