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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Galvanometer Ammeter Figure of merit Shunt resistance How a galvanometer can be converted into an ammeter.
It is represented by the symbol k and is given by the equation. This is congersion I know so far. The current always splits inversely to the ratio of the reaistances. Conversion of Galvanometer to Ammeter. Converting a galvanometer into an Ammeter Ask Question. 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 converrsion 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.
Home Questions Tags Users Unanswered. You understood this part wrong. Let G be the resistance of the galvanometer and Ig be the current for full scale deflection in the galvanometer, the value of the voltketer resistance required to convert the galvanometer into an ammeter of 0 to I ampere is. 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.
For the ammeter rated for 1 A, the Ig max value will be reached voltmetet when galvanimeter are allowing 1 A through the ammeter. Whiskeyjack 3, 2 17 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. To convert the given galvanometer of known resistance and figure of merit into an ammeter of desired range and to verify the same.
Where E is the e.
Deflection of needle is not always going to be maximum. If you pass a current higher than rated galvanoeter 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 the ammeter rated A, Ig max will be reached when measured current is A. Email Required, but never shown. If Ig is less than Vkltmeter maxthe needle will stay somewhere in between. It has a coil pivoted or suspended between concave pole faces of a strong laminated horse shoe magnet. The student learns the following concepts: Ig is always passing through the galvanometer so how does the ammeter really work and give us current in amperes?
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. The figure of merit of a galvanometer is defined as the current required in producing a unit deflection in the scale of the galvanometer.
Conversion of Galvanometer to Ammeter (Theory) : Class 12 : Physics : Amrita Online Lab
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Now, a shunt resistance is added in parallel. Let’s look at a very simple example first. Maximum deflection occurs at Ig max. Sign up using Email and Password. 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 am 12th grader just in case. How to convert a Galvanometer into an Ammeter? Galvanometer is too sensitive therefore is modified to be used to measure current instead of only detect it.
The maximum current that the ammeter produced can measure is lets say I and shunt resistance is Rs.
Anyway, I do understand how a galvanometer is converted into an ammeter but it’s logic doesn’t seem to add up.