Class 4 (4th Engineer) MET 📅 Jul 2023

Exam Question

The open-circuit voltage of a cell as measured by a voltmeter of 100 ohm resistance, was 1.5 V, and the p.d. When supplying current to a 10 ohm resistance was 1.25 V; measured by the same voltmeter. Determine the e.m.f. and internal resistance of the cell (16)

Reference Answer

### **Objective**
To determine the true electromotive force (e.m.f.) and the internal resistance of a cell, accounting for the loading effect of a non-ideal voltmeter.
### **Underlying Principles**
1. **Electromotive Force (e.m.f. or E):** The total voltage generated by a source (like a cell) when no current is drawn. It represents the total energy supplied per unit charge.

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