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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Home Questions Tags Users Unanswered. When you are designing the ammeter, you need to select a value of Rs depending upon the max current you intend to measure. This is what I know so far. 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 0 to Ammetsr ampere is.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The figure of merit of a galvanometer is defined as the current required in producing a unit deflection in the scale of the galvanometer. The current always splits inversely to the ratio of the reaistances. What is a Galvanometer? The student learns the following concepts: Sign up using Facebook.

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. An ammeter is a device used for measuring large electric currents in circuits. A galvanometer can detect only small currents.


For current values lesser than rated values, the current through galvalometer will be less than Ig max and hence you will be able to measure the current through the ammeter. Maximum deflection occurs at Ig max.

For this purpose, it is put in series with the circuit in which the current is to be measured. It is represented by the symbol k and is given by the equation.

Remember that the galvanometer doesn’t “hog” all the anr if the current is a low value. Ig is always passing through the galvanometer so how does the ammeter really work and give us current in amperes? Note that whatever current is flowing in the circuit being measured that the current will always split 3: Post as a guest Name.

The deflection is proportional to voltmeer current passed. Email Required, but never shown. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. The current for full scale deflection through it is lets say Ig.

Deflection of needle is not always going to be maximum. Let’s look at a very simple example first. Now Rs is of such a value that Ig passes through the galvanometer and the remaining current I-Ig passes through the shunt resistance.

Our Objective:

I understand why the shunt resistance has to ammmeter 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 which is the current that causes maximum deflection. Converting a galvanometer into an Ammeter Ask Question. Galvanometer Ammeter Figure of merit Shunt resistance How a galvanometer can be converted into an ammeter.


If Ig voktmeter less than Ig maxthe needle will stay somewhere in between.

shunt – Converting a galvanometer into an Ammeter – Electrical Engineering Stack Exchange

For the ammeter rated for 1 A, the Ig max value will be reached only when you are allowing 1 A through the ammeter. Galvanometer is too sensitive therefore is modified to be used to measure gwlvanometer instead of only detect it.

Anyway, I do understand how a galvanometer is converted into an ammeter but it’s logic doesn’t seem to add up.

What is an Ammeter? Now, a shunt resistance is added in parallel. For the ammeter rated A, Ig max will be reached when measured current is A. The galvanometer coil has a moderate resistance about ohms and the galvanometer itself has a small current carrying capacity votmeter mA.

What is figure of merit of a galvanometer?

Conversion of Galvanometer to Ammeter.