Exam Question
With the aid of a circuit diagram, explain how a Galvanometer can be used as a Voltmeter. (16)
Class 4 (4th Engineer)
MET
📅 Nov 2023
Reference Answer
A galvanometer is a sensitive electromagnetic device used for detecting and measuring small electric currents. By modifying its internal circuitry with the addition of a high series resistance, it can be effectively converted into a voltmeter capable of measuring potential differences across various points in an electrical circuit.
### 1. Principle of Operation of a Galvanometer
* **Electromagnetic Deflection**: A galvanometer operates on the principle that a current-carrying coil placed in a magnetic field experiences a torque, causing it to rotate. The magnitude of this torque, and thus the angular deflection of the coil, is directly proportional to the current flowing through it.
* **Construction**: Typically, a moving coil galvanometer consists of:
### 1. Principle of Operation of a Galvanometer
* **Electromagnetic Deflection**: A galvanometer operates on the principle that a current-carrying coil placed in a magnetic field experiences a torque, causing it to rotate. The magnitude of this torque, and thus the angular deflection of the coil, is directly proportional to the current flowing through it.
* **Construction**: Typically, a moving coil galvanometer consists of:
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