alleryStart learning →The commercial unit of electrical energy, '1 unit', is
A1 joule
B1 kilowatt-hour
C1 watt
D1 volt-ampere
Answer & Solution
Correct answer: B. 1 kilowatt-hour
1. The joule is too small for household billing.
2. Electrical energy is billed in the **kilowatt-hour (kWh)**, called '1 unit'.
3. $1\ \text{kWh} = 1000\ \text{W} \times 3600\ \text{s} = 3.6\times10^6$ J.
_Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch12 'Electricity', §12.6_
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