why voltmeter connected in parallel?how to convert galvanometer into ammeter.

Why voltmeter connected in parallel ?& How to Convert Galvanometer into Ammeter, Voltmeter & Ohmmeter.


A galvanometer is an instrument that can detect and measure the flow of electricity. Early galvanometers were not calibrated. However, with improved version is called ammeters, the current can be calibrated and the current measured more accurately.

The galvanometer works by diverting a pointer in response to an electric current flowing through a coil in a constant magnetic field. As a result , Galvanometers considered as a type of actuator.

Why voltmeter connected in parallel ?

The voltmeter is a galvanometer (with high resistance). It is connected in parallel as it measures the potential drop on any part of an electrical circuit. As a result, it does not draw a current of its own (due to high resistance) and does not affect the net resistance of the circuit.

Q:How to convert galvanometer into ammeter ?

A: Galvanometer convert into an ammeter, Just connect a small resistor (shunt) parallel to the Galvanometer .

Resistance of Ammeter, R A = G r s / G + r s 

Q: How to convert galvanometer into voltmeter ?

A:  Connect a high resistance ‘R’ range to convert a galvanometer to a voltmeter

Resistance of voltmeter, RV = G + R  

Q: How to convert galvanometer into ohmmeter ?

A: Connect an adjustable win resistance r and a cell in a series to convert a galvanometer to a ohmmeter.