Question

Assertion (A): Kilowatt-hour (kWh) is the commercial unit of electrical energy.
Reason (R): \( 1\, \text{kWh} = 10^6\, \text{Joules} \)

• A. Both A and R are true and R is the correct explanation of A.
• B. Both A and R are true but R is not the correct explanation of A.
• C. A is true but R is false.
• D. A is false but R is true.

Hint:

kWh is the practical unit for billing electrical energy, and 1 kWh = 3.6 × 10$^6$ J.

Answer 1

The Correct Option is A

Electrical energy used in households is measured in kilowatt-hours. One kilowatt-hour equals \( 1000 \times 3600 = 3.6 \times 10^6 \, \text{J} \), but commonly rounded to \(10^6\) in estimation.