Question

A certain type of D-cell battery that costs $0.50 is capable of producing 1.2 V and current of 0.1 A for a period of 75 hours. Determine the cost of the energy delivered by this battery per kilowatt hour.

Answer 1

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