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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Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read voltmeteer updated terms of serviceprivacy policy and cookie policyammfter that your continued use of the website is subject to these policies. It has a coil pivoted or suspended between concave pole faces of a strong laminated horse shoe magnet. Home Questions Tags Users Unanswered. Post as a guest Name. Converting a galvanometer into an Ammeter Ask Question. A galvanometer can detect only small currents.

It can be converted into an ammeter by connecting a low resistance called shunt resistance in parallel to the galvanometer. The deflection is proportional to the current passed. Sign up using Facebook. Sign up or log in Sign up using Google. Email Required, but never shown.

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

The current always splits inversely to the ratio convesion the reaistances. For the ammeter rated for 1 A, the Ig max value will be reached only when you are allowing 1 A through the ammeter. A galvanometer is a device used to detect feeble electric currents in a circuit. Thus, to measure large currents it is converted into an ammeter.


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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 for full scale deflection through it is lets say Ig. Anyway, I do understand how a galvanometer is ahd into an ammeter but it’s logic doesn’t seem to add up. Remember that the galvanometer doesn’t “hog” all the current if the current is a low value.

Sign up using Email and Password. 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.

Where E is the e. The student learns the following concepts: Conversion of Galvanometer to Ammeter. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. 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.

When you are designing the ammeter, you need to select a value of Rs depending upon the max current you intend to measure. Whiskeyjack 3, 2 17 The galvanometer coil has a moderate resistance about ohms and the galvanometer itself has a small current carrying intto 1 mA. Ig is always passing through the galvanometer so how does the ammeter really work and give us current in amperes?


Galvanometer is too sensitive therefore is modified to be used to measure current instead of only detect it. Galvnometer ex – an ammeter which can measure current up to 1 A will use a larger value ammetwr Rs as compared to an ammeter which can measure a current up to A. It is represented by the symbol k and is given by the equation.

I am 12th grader just in case.

The maximum current that the ammeter produced can measure is abd say I and shunt resistance is Rs. How to convert a Galvanometer into an Ammeter? Galvanometer Ammeter Figure of merit Shunt resistance How a galvanometer can be converted into an ammeter.

What is an Ammeter? This is what I know so far. When an electric current passes through the coil, it deflects. Now Rs is of such a value that Ig passes through the galvanometer and the remaining current I-Ig passes through the shunt resistance. Note that whatever current is flowing in the cnoversion being measured that the current will always split 3: For the ammeter rated A, Ig max will be reached when measured current is A.

Deflection of needle is not always going to be maximum.