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. Converting a galvanometer into an Ammeter Ask Question.
For the ammeter rated for oc A, the Ig max value will be reached only when you are allowing 1 A through the ammeter. Post as a guest Name. cohversion
shunt – Converting a galvanometer into an Ammeter – Electrical Engineering Stack Exchange
The deflection is proportional to the current passed. The figure of merit of a galvanometer is defined as the current required in producing a unit deflection in the scale of the galvanometer.
Galvanometer voltmeteg too sensitive therefore is modified to be used to measure current instead of only detect it. Sign up using Facebook. 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.
This is what I know so far. Remember that the galvanometer doesn’t “hog” all the current if the current is a low value. 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.
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 ga,vanometer I fail to comprehend is how can we successfully measure current when the deflection of the needle is going to always be maximum due galvanometter the passage of Ig current.
Home Questions Tags Users Unanswered. Maximum deflection occurs at Ig max. A galvanometer is a device used to detect feeble electric currents in a circuit.
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 Akmeter ampere is. The galvanometer coil has a moderate resistance about ohms and the galvanometer itself has a small current carrying capacity 1 mA.
Deflection of needle is not always going to be maximum. Sign up or log in Sign up using Google. Ruqaiya Naeem 13 3. An ammeter is a device used for measuring large electric currents in circuits.
Conversion of Galvanometer to Ammeter (Theory) : Class 12 : Physics : Amrita Online Lab
To convert the given galvanometer of known resistance and figure of merit into an ammeter of desired range and to verify the same. Let’s look at a very simple example first. 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 to always be maximum due to the passage of Ig current which is the current that causes maximum deflection.
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. Thus, to measure large currents it is converted into an ammeter. The current always splits inversely to the ratio of the reaistances.
It has a coil pivoted or suspended between concave pole faces of a strong laminated horse shoe magnet. When an voltmeterr current passes through the coil, it deflects.
What is a Galvanometer? Where E is the e. Conversion of Galvanometer to Ammeter. Now Rs is of such a value that Ig passes through the galvanometer and the remaining current I-Ig passes through the shunt resistance.
Sign up using Email and Password. 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 Goltmeter 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.
It is represented by the symbol k and is given by the equation. Voltmetsr the ammeter rated A, Ig max will be reached when measured current is A. Note that whatever current is flowing in the circuit being measured that the current will always split 3: What is figure of merit of a galvanometer? The student learns the following amketer 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.