Answer:
$55.55/ kWh
Explanation:
Data provided in the question:
Cost of the D-cell battery = $0.50
Voltage produced by the battery, V = 1.2 V
Current produced = 0.1 A
Time = 75 hours
Now,
Energy produced by the battery = Voltage × Current × Time
= 1.2 × 0.1 × 75
= 9 Wh
= 9 × 10⁻³ kWh = 0.009 kWh
Therefore,
Cost of the energy delivered = Cost of the D-cell battery ÷ Energy produced
= $0.50 ÷ 0.009 kWh
= $55.55/ kWh
