Voltmeter and its use

 

Introduction:

 

A galvanometer having high resistance in series is called a voltmeter. It is used to measure potential difference.

 

 

Working:

 

The potential difference across a resistance is directly’ proportional to the current passing through it. As the deflection of the pointer is directly proportional to the current, therefore the deflection of the pointer is directly proportional to the potential difference. A small potential difference produces a full-scale deflection in a galvanometer. In order to measure high potential difference, a high resistance is connected in series with the galvanometer. Most of the potential difference drops across the high resistance. Value of resistor connected in series depends upon the range of the voltmeter. In order to measure the potential difference, a voltmeter is always connected in parallel to the circuit components.

 

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