allery1 kilowatt-hour (kWh), the commercial unit of electrical energy, equals:
A1000 J
B3.6 × 10⁶ J
C1.6 × 10⁻¹⁹ J
D1000 W
Answer & Solution
Correct answer: B. 3.6 × 10⁶ J
1. 1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J.
2. Your electricity bill is in units of kWh.
3. A 1000 W heater running for 1 hour consumes 1 kWh.
_Source: syllabus Science Ch 11 §11.6.2 Commercial Unit of Electric Energy_
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