Exam Question
(a) Explain the working principle of an alkaline battery (8)
(b) Compare the alkaline battery with Lead-Acid battery (8)
Class 4 (4th Engineer)
MET
📅 Apr 2024
Reference Answer
### (a) Working Principle of an Alkaline Battery (8 Marks)
An alkaline battery is a primary cell (typically non-rechargeable) that generates electrical energy through an electrochemical reaction between Zinc (Zn) and Manganese Dioxide (MnO₂) using an alkaline electrolyte, typically Potassium Hydroxide (KOH).
**1. Construction:**
* **Anode (Negative Electrode):** Consists of powdered Zinc mixed into a gel with the Potassium Hydroxide electrolyte. Powdering increases the surface area for a more efficient reaction and higher current delivery.
An alkaline battery is a primary cell (typically non-rechargeable) that generates electrical energy through an electrochemical reaction between Zinc (Zn) and Manganese Dioxide (MnO₂) using an alkaline electrolyte, typically Potassium Hydroxide (KOH).
**1. Construction:**
* **Anode (Negative Electrode):** Consists of powdered Zinc mixed into a gel with the Potassium Hydroxide electrolyte. Powdering increases the surface area for a more efficient reaction and higher current delivery.
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