alleryAn electric heater of power 1000 W is used for 3 hours every day. How much electrical energy does it consume in one day?
A0.33 kWh
B3 kWh
C300 kWh
D3000 kWh
Answer & Solution
Correct answer: B. 3 kWh
1. Convert power to kilowatts: $1000\,\text{W} = 1\,\text{kW}$.
2. Energy in kWh = power (kW) $\times$ time (h).
3. $E = 1 \times 3 = 3\,\text{kWh}$.
4. The value 3000 forgets the W to kW conversion.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 4 Electricity "Electricity", p.64_
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