Class 4 (4th Engineer) MET 📅 Apr 2024

Exam Question

(a) Explain the principle of conservation of charge and its relationship to Kirchhoff's current law. (6)

(b) 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. (10)

Reference Answer

### (a) Principle of Conservation of Charge and Kirchhoff's Current Law (6 Marks)
**1. Principle of Conservation of Charge:**
This is a fundamental principle in physics which states that the net electric charge in an isolated system remains constant. Charge cannot be created or destroyed; it can only be transferred from one object to another. In the context of an electrical circuit, this implies that there can be no accumulation of charge at any point or junction within the circuit.
**2. Kirchhoff's Current Law (KCL):**

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