Question 1
- Draw the following batteries and label two parts of each type:
- (i)wet cell battery;
- (ii)dry cell battery.
- (b) State the function of vents in a motor vehicle battery.
- (c)State one effect each of the following in the operation of a battery:
- (i)decrease in the electrolyte level:
- (ii)terminal sulphation.
Observation
The expected answers were;
- (b)Function of vents in a motor vehicle battery
- To release the gases produced during charging or discharging.
- To prevent built up gases in the battery casing.
- (c)
- (i)Effect of decreased electrolyte level in the operation of a battery
- Rapid loss of water leading to increased acid concentration;
- Irreversible sulphation;
- Damage of cell;
- Longer charging time due to decrease in cell capacity and time;
- Frequent discharge of the batteries.
- (ii)Effect of terminal sulphation in the operation of a battery
- Oxidation leading to circuit breakdown
- Increase resistance in the flow of electricity from the terminals to the cable;
- Premature replacement of battery;
- Corrosion of battery post;
- Corrosion of battery terminal.