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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Anyway, I do understand how a galvanometer is converted into an ammeter but it’s logic doesn’t seem to add up. 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. 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.
Retrieved 1 Januaryfrom amrita. Maximum deflection occurs at Ig max.
The figure of merit of a galvanometer is defined as the current required in producing a unit deflection in the scale of the galvanometer. Deflection of needle is not always going to be maximum. You understood this part wrong.
What is a Galvanometer? Galvanometer is too sensitive therefore is modified to be used to measure current instead of only detect it. What is an Ammeter? I understand why the shunt resistance has aand 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 conversioh that causes maximum deflection.
This is what I know so far.
For this purpose, it is put in series with the circuit in which the current is to be measured. 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 ammetdr always be maximum due to the passage of Ig current. The current always splits inversely to the ratio of the reaistances.
When you are designing the ammeter, you need to select a value galanometer Rs depending upon the max current you intend to measure. Now, a shunt resistance is added in parallel. 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 0 to I ampere is.
A galvanometer is a device used to detect feeble electric currents in a circuit. The deflection is proportional to the current passed. Whiskeyjack 3, 2 17 An ammeter is a device used for measuring large electric currents in circuits. The galvanometer coil has a moderate resistance about ohms and the galvanometer itself has a small current carrying capacity 1 mA.
For the ammeter rated for 1 A, the Ig max value will be reached only when you are allowing 1 A through the ammeter.
shunt – Converting a galvanometer into an Ammeter – Electrical Engineering Stack Exchange
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. Sign up using Facebook. For ex voltmete 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.
Home Questions Tags Users Unanswered. Converting a galvanometer into an Ammeter Ask Question. Ig is always passing through the galvanometer so how does the ammeter really work and give us current in amperes?
Galvanometer Ammeter Figure of merit Volmteter resistance How a galvanometer can be converted into an ammeter. The maximum current that the ammeter produced can measure is lets say I and shunt resistance is Rs. It can be converted into an ammeter by connecting a low resistance called shunt resistance in parallel to the galvanometer.
It is represented by the symbol k and is given by the equation. A galvanometer can detect only small currents. To convert the given galvanometer of known resistance and figure of merit into an ammeter of desired range and to verify the same.
How to convert a Galvanometer into an Ammeter? Where E is the e. Sign up using Email and Password.