Question
Download Solution PDFThe watt hour efficiency of a lead cell varies between ________ and ________ %.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThere are two ways of expressing the efficiency of a secondary cell.
Ampere hour efficiency: It is the ratio of output ampere-hours to input ampere-hours of the cell.
Ampere hour efficiency,
The ampere-hour efficiency of a lead-acid cell is about 90%.
Watt-hour efficiency: It is the ratio of output energy to the input energy of the cell.
Watt-hour efficiency,
The watt-hour efficiency of a lead-acid cell varies between 70% to 80%.
Important point:
The efficiency of a lead-acid cell depends upon the following factors:
- Rate of charge and discharge
- Internal resistance and polarisation
- The time interval between the end of discharge and the commencement of recharge.
- Temperature
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