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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Converting a galvanometer into an Ammeter Ask Question. Maximum deflection occurs at Ig max. Sign up using Email and Password. Sign up or log in Sign up using Google.
Home Questions Tags Users Unanswered. Post as a guest Name. Where E is the e. A galvanometer is a device used to detect feeble electric currents in a circuit. How to convert a Galvanometer into an Ammeter?
For ex – an ammeter which can measure current up to 1 A will use a larger value of Rs as compared to an ammeter voltmerer can measure a current up to A. It is represented by the symbol k and is given by the equation.
I understand why the shunt resistance has to be of galvanomeer smaller value and the resistance of voltmeter has to be of a really greater value but what Galvanomwter 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. I am 12th grader just in case. An ammeter is a device used for measuring large electric currents in circuits.
Galvanometer is too sensitive therefore is modified to be used to measure current instead of only detect it. It can be converted into an ammeter by connecting a low resistance called shunt resistance in parallel to the galvanometer.
Conversion of Galvanometer to Ammeter (Theory) : Class 12 : Physics : Amrita Online Lab
This is what I know so far. The figure of merit of a galvanometer is defined as the current required in producing a unit deflection in the scale of the galvanometer.
You understood this part wrong. When you are designing the ammeter, you need to select a value of Rs depending upon the max current you intend to measure. Email Required, but never shown.
For the ammeter rated for 1 A, the Ig max value will be reached only when you are allowing 1 A through the ammeter. 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. The current always splits inversely to the ratio of the reaistances. Let’s look at a very simple example first.
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. For this purpose, it is put in series with the circuit in which the current is to be measured. Galvanometer Ammeter Figure of merit Shunt resistance How a galvanometer can be converted into an ammeter. Note that whatever current is flowing in the circuit being measured that the current will always split 3: 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.
To convert the given galvanometer of known resistance and figure of merit into an ammeter of desired range and to verify the same.
Now, a shunt resistance is added in parallel. Remember that the galvanometer doesn’t “hog” all the current if the current is a low value.
Conversion of Galvanometer to Ammeter. Ruqaiya Naeem 13 3. When an electric current passes through the coil, it deflects. Sign up using Facebook. The galvanometer coil has a moderate resistance about ohms and the galvanometer itself has a small current carrying capacity 1 mA.
shunt – Converting a galvanometer into an Ammeter – Electrical Engineering Stack Exchange
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 galvanoeter is. A galvanometer can detect only small currents. If Ig is less than Ig maxthe needle will stay somewhere in between.