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.
|Published (Last):||14 February 2005|
|PDF File Size:||17.56 Mb|
|ePub File Size:||1.31 Mb|
|Price:||Free* [*Free Regsitration Required]|
The figure of merit of a galvanometer is defined as the current required in producing a unit deflection in the scale of the galvanometer. When an electric current passes through the coil, it deflects. I am 12th grader just in case. How to convert a Galvanometer into an Ammeter? Home Questions Tags Users Unanswered.
Conversion of Galvanometer to Ammeter. If you pass a current higher than rated value eg – 2 A through 1 A rated ammeterthe needle will show full deflection galvannometer there is no way of knowing the exact value of current passing through it. Anyway, I do understand how a galvanometer is converted into an ammeter but it’s logic doesn’t seem to add up. Ig is always passing through conversoin galvanometer so how does the ammeter really work and give us current in amperes?
This is what I know so far.
Sign up using Facebook. Galvanometer is too sensitive therefore is modified to be used to measure current instead of only detect it. Galvanometer Ammeter Figure of merit Shunt resistance How a galvanometer can be converted into an ammeter. For ex – an ammeter which can measure current up ammeher 1 A will use a larger value of Rs as compared to an ammeter which can measure a current up to A.
Deflection of needle is not always going to be maximum. It can be converted into an ammeter by connecting a low resistance called shunt resistance in parallel to the galvanometer.
It has a coil pivoted or suspended between concave pole faces of a andd laminated horse shoe magnet.
shunt – Converting a galvanometer into an Ammeter – Electrical Engineering Stack Exchange
It is represented by the symbol k and is given by the equation. A galvanometer is a device used to detect feeble electric currents in a circuit. Converting a galvanometer into an Ammeter Ask Question.
The current always splits inversely to the ratio of the reaistances. Now Rs is of such a value that Ig passes through the galvanometer and the remaining current I-Ig passes through the shunt resistance. For the ammeter rated for 1 A, the Ig max value will be reached only when you are allowing 1 A through the ammeter. 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 Ig maxthe needle will stay somewhere in between. Note that whatever current is flowing in the circuit being measured that the current will always split 3: Remember that the galvanometer doesn’t “hog” all the current if the current is a low value.
The deflection is proportional to the current passed. The galvanometer coil has a moderate resistance about ohms and the galvanometer itself has a small current carrying capacity 1 mA. What is a Galvanometer? What is an Ammeter?
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.
Post as a guest Name. To convert the given galvanometer of known resistance and figure of merit into an ammeter of desired range and to verify the same. Intto 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 Sign up or log in Sign up using Google.
Conversion of Galvanometer to Ammeter (Theory) : Class 12 : Physics : Amrita Online Lab
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.
Now, a shunt resistance is added in parallel. What is figure of merit of a galvanometer? The student learns the following concepts: 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 maximum current that the ammeter produced can measure is lets say I and shunt resistance is Rs. Maximum deflection occurs at Ig max. 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.
Ruqaiya Naeem 13 3. An ammeter is a device used for measuring large electric currents in circuits. 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.