Exam Question
(a) Describe the changes which take place within a lead-acid battery during discharge and when charging is taking place. (10)
(b) What are the safety features you would find in: (10)
(i) paint store
(ii) battery room
Class 4 (4th Engineer)
SSEP
📅 Dec 2025
Reference Answer
### Part (a): Changes within a Lead-Acid Battery (10 Marks)
A lead-acid battery cell stores chemical energy and converts it into electrical energy through an electrochemical reaction. The primary components are:
* **Positive Plate (Anode during discharge):** Lead Peroxide (PbO₂), dark chocolate brown in colour.
* **Negative Plate (Cathode during discharge):** Spongy Lead (Pb), grey in colour.
A lead-acid battery cell stores chemical energy and converts it into electrical energy through an electrochemical reaction. The primary components are:
* **Positive Plate (Anode during discharge):** Lead Peroxide (PbO₂), dark chocolate brown in colour.
* **Negative Plate (Cathode during discharge):** Spongy Lead (Pb), grey in colour.
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