A gas water heater is 75% efficient. The energy output used to heat the water is 4.6 kWh.
Answer
A
3.5 kWh
B
5.4 kWh
C
6.1 kWh
D
16.3 kWh
Explanation
Efficiency is useful output energy divided by input energy. So the energy supplied to the heater is 4.6 kWh ÷ 0.75 ≈ 6.1 kWh. The correct choice is 6.1 kWh.
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