Exam Question
(a) Distinguish between primary and secondary cells. (4)
(b) Explain Internal resistance in a battery. (4)
(c) What are the factors affecting internal resistance of a battery. (8)
Class 4 (4th Engineer)
MET
📅 Sep 2023
Reference Answer
### (a) Distinction between Primary and Secondary Cells
A primary cell is a single-use electrochemical cell where the chemical reaction is not reversible. Once the reactants are consumed, the cell cannot be recharged. A secondary cell is a rechargeable electrochemical cell where the chemical reaction is reversible by applying an external electrical source.
| Feature | Primary Cell | Secondary Cell |
|-----------------------|------------------------------------------------------|--------------------------------------------------------|
A primary cell is a single-use electrochemical cell where the chemical reaction is not reversible. Once the reactants are consumed, the cell cannot be recharged. A secondary cell is a rechargeable electrochemical cell where the chemical reaction is reversible by applying an external electrical source.
| Feature | Primary Cell | Secondary Cell |
|-----------------------|------------------------------------------------------|--------------------------------------------------------|
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