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
📅 Oct 2024
Reference Answer
### (a) Changes within a Lead-Acid Battery
A lead-acid battery stores electrical energy in the form of chemical energy. The process is reversible, allowing the battery to be charged and discharged multiple times. The key components are the positive plate (Lead Dioxide, PbO₂), the negative plate (Spongy Lead, Pb), and the electrolyte (a solution of Sulfuric Acid, H₂SO₄, and water, H₂O).
#### **During Discharge (Delivering Energy)**
When the battery supplies power to a load, a spontaneous electrochemical reaction occurs, converting stored chemical energy into electrical energy.
A lead-acid battery stores electrical energy in the form of chemical energy. The process is reversible, allowing the battery to be charged and discharged multiple times. The key components are the positive plate (Lead Dioxide, PbO₂), the negative plate (Spongy Lead, Pb), and the electrolyte (a solution of Sulfuric Acid, H₂SO₄, and water, H₂O).
#### **During Discharge (Delivering Energy)**
When the battery supplies power to a load, a spontaneous electrochemical reaction occurs, converting stored chemical energy into electrical energy.
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