Ten 8 W lamps run for 5 hours. Total energy used?
A4 kWh
B40 kWh
C0.04 kWh
D0.4 kWh
Answer & Solution
Correct answer: D. 0.4 kWh
Ten lamps draw 80 W, so five hours uses 400 Wh or 0.4 kWh.
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