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. Author: Gusho Mazuzshura Country: Madagascar Language: English (Spanish) Genre: Video Published (Last): 18 April 2009 Pages: 267 PDF File Size: 13.20 Mb ePub File Size: 12.75 Mb ISBN: 250-3-52327-278-8 Downloads: 24557 Price: Free* [*Free Regsitration Required] Uploader: Mezitaxe The galvanometer coil has a moderate resistance about ohms and the galvanometer itself has a small current carrying capacity 1 mA. The figure of merit of a galvanometer is defined as the current required in producing a unit deflection in the scale of the galvanometer. Email Required, but never shown. It is represented by the symbol k and is given by the equation. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Now Rs is of such a value that Ig passes through the galvanometer and the remaining current I-Ig passes through the shunt resistance.

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 coversion 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.

KUSTINO ORO PDF The student learns the following concepts: What is a Galvanometer? The deflection is proportional to the current passed. Home Questions Tags Users Unanswered.

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

The maximum current that the ammeter produced can measure is lets say I and shunt resistance is Rs. If Ig is less than Ig maxthe needle will stay somewhere in between. Retrieved 1 Januaryfrom amrita. Deflection of needle is not always going to be maximum. 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 which is the current that causes maximum deflection.

Sign up using Facebook. To convert the given galvanometer of known resistance and figure of merit into an ammeter of desired range and to verify the same. 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. It can be converted into an ammeter by connecting a low resistance called shunt resistance in parallel to the galvanometer.

A galvanometer is a device used to detect feeble electric currents in a circuit. For this purpose, it is put in series with the circuit in which the current is to be measured. You understood this part wrong. Now, a shunt resistance is added in parallel. Maximum deflection occurs at Ig max.

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Conversion of Galvanometer to Ammeter. Anyway, I do understand how a galvanometer is converted into an ammeter but it’s logic doesn’t seem to add up. Sign up using Email and Password. When an electric current passes through the coil, it deflects. For the ammeter rated for 1 A, the Ig max value will be reached only when you are allowing 1 A through the ammeter. Let’s look at a very simple example first. When you are designing the ammeter, you need to select a value of Rs depending upon the max current you intend to measure.

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The current always splits inversely to the ratio of the reaistances. A galvanometer can detect only small currents. Converting a galvanometer into an Ammeter Ask Question.

Ig is always passing through the galvanometer so how does the ammeter really work and foltmeter us current in amperes? Whiskeyjack 3, 2 17 Galvanometer is too sensitive therefore is modified to be used to measure current instead of only detect it. What is figure of merit of a galvanometer?

I am 12th grader just in case.

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

For the ammeter rated A, Ig max will be reached when measured current is A. This is what I know so far. 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.

Note that whatever current is flowing in the circuit being measured that the current will always split 3: 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 I ampere is.

How to convert a Galvanometer into an Ammeter? Ruqaiya Naeem 13 3.