Question

The kilowatt hour is the unit of

• A. Potential difference
• B. Current
• C. Electrical energy
• D. Electrical resistance

Answer 1

The Correct Option is C

To solve the problem, we need to identify what physical quantity is measured in kilowatt-hours.

1. Understanding Kilowatt-Hour:
A kilowatt-hour (kWh) is a unit of energy commonly used to measure electrical energy consumption. It represents the amount of energy used when 1 kilowatt (1000 watts) of power is used for 1 hour.

2. Relation to Energy:
Since power × time = energy:
\( \text{Energy} = \text{Power} \times \text{Time} \)
A kilowatt-hour is a derived unit of energy.

3. SI Unit Equivalence:
1 kWh = \( 1000 \times 3600 \) joules = 3.6 × 10⁶ joules

4. Elimination of Other Options:
- Potential difference is measured in volts (V)
- Current is measured in amperes (A)
- Electrical resistance is measured in ohms (Ω)

Final Answer:
The kilowatt-hour is the unit of Electrical energy.