Conversion of a Galvanometer into Ammeter and Voltmeter. Voltmeter: It is a high resistance galvanometer, used to measure potential. Conversion of a galvanometer into voltmeter & Ammeter. 1. KAMALJEETH INSTRUMENTS. Experiment S. GALVANOMETER AND ITS. CONVERSION . Voltmeter and Ammeter. Objective: (a) To convert a galvanometer into a voltmeter reading up to V volts and calibrate it. (b) To convert a galvanometer into an.

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For ex – an ammeter which can measure current up to 1 A will use a larger value of Rs as compared to an ammeter which can measure a current up to A. The galvanometer coil has a moderate resistance about ohms and the galvanometer itself has a small current carrying capacity 1 mA.

A galvanometer can detect only anc currents.

Whiskeyjack 3, 2 17 Now Rs is of such a value that Ig passes through the galvanometer and the remaining current I-Ig passes through the shunt resistance. When an electric current passes through the coil, it deflects.

Where E is the e. The figure of merit of a galvanometer is defined as the current required in producing a unit deflection in the scale of the galvanometer. convedsion

What is a Galvanometer? It has a coil pivoted or suspended between concave pole faces of a strong laminated horse shoe magnet. I understand why the shunt resistance has to be of a smaller value and the resistance of voltmeter has to be of a really greater value but what I fail to comprehend is how can we successfully measure current when the deflection of the needle is going to always be maximum due to the passage of Ig current Remember that the galvanometer doesn’t “hog” all the current if the current is a low value.


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You understood this part wrong. Converting a galvanometer into an Ammeter Ask Question. Remember that the galvanometer doesn’t “hog” all the current if the current is a low value. The maximum current that the ammeter produced can measure is lets say I and shunt qnd is Rs.

Conversion of Galvanometer to Ammeter (Theory) : Class 12 : Physics : Amrita Online Lab

Sign up or log in Sign up using Google. I am 12th grader just in case. If Ig is less than Ig maxthe needle will stay somewhere in between. Let’s look at a very simple example first. It can be converted into an ammeter by connecting a low resistance called shunt resistance in parallel to the galvanometer. To convert the given galvanometer of known resistance and figure of merit into an ammeter of desired range and to verify the same.

Ig is always passing through the galvanometer so how does the ammeter really work and give us current in amperes? The current always splits inversely to the ratio of the reaistances.


If you pass a current higher than rated value eg – 2 A through 1 A rated ammeterthe needle will show full deflection and there is no way of knowing the exact value of current passing through it. Email Required, but never shown. Note that whatever current is flowing in the circuit being measured that the current will always split 3: What is figure of merit of a galvanometer?

What is an Ammeter? Sign up using Email and Password. Thus, to measure large currents it is converted into an ammeter.

Let G be the resistance of the galvanometer and Ig be the current for full scale deflection in the galvanometer, the value of the shunt resistance required to convert the galvanometer into an ammeter of convrsion to I ampere is. The current for full scale deflection through it is lets say Ig.

Our Objective:

An ammeter is a device used for measuring large electric currents in circuits. For this purpose, it is put in series with the circuit in which the current is to voltmetrr measured. The deflection is proportional to the current passed.

How to convert a Galvanometer into an Ammeter?