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SSC JE Electrical Engineering 2017 Set 1 Paper

Question : 106 of 200

Marks: +1, -0

Which efficiency of the battery is more?

Solution:

Ampere hour efficiency =

\frac{\text{Ampere (Discharge)} \times \text{Time (hours)}}{\text{Ampere (Charge)} \times \text{Time (hours)}} \times 100

Watt-hour efficiency =

\frac{\text{Ampere Voltage (Discharge)} \times \text{Time (hours)}}{\text{Ampere Voltage (Charge)} \times \text{Time (hours)}} \times 100

Voltage at discharge is lower then charge. So Amperehour efficiency is higher 90% then watt-hour efficiency is 75% approx, and

over all efficiency < 75%.

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