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):||21 May 2013|
|PDF File Size:||5.37 Mb|
|ePub File Size:||17.58 Mb|
|Price:||Free* [*Free Regsitration Required]|
I am 12th grader just in case. When you are designing the ammeter, you need to select a value of Rs depending upon the max current you intend to measure. Deflection of needle is not always going to be maximum. Let’s look at a very simple example first. 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.
Converting a galvanometer into an Ammeter Ask Question. Galvanometer is too sensitive therefore is modified to be used to measure current instead of only detect it. For the ammeter rated for 1 A, the Ig max value will be reached only when you are allowing 1 A through the ammeter. Whiskeyjack 3, 2 17 Sign up using Email and Password.
It has a coil pivoted or suspended between concave pole faces of a strong laminated horse shoe magnet. Sign up or log in Sign up using Google. For the ammeter rated A, Ig max will be reached when measured current is A.
Thus, to measure large currents it is converted into an ammeter. If Ig is less than Ig maxthe needle will stay somewhere in between.
shunt – Converting a galvanometer into an Ammeter – Electrical Engineering Stack Exchange
How to convert a Galvanometer ammete an Ammeter? For conevrsion purpose, it is put in series with the circuit in which the current is to be measured. Post as a guest Name. An ammeter is a device used for measuring large electric currents in circuits. The figure of merit of a galvanometer is defined as the current required in producing a unit deflection in the scale of the galvanometer. What is a Galvanometer? The deflection is proportional to the current passed. It is represented by the symbol k and is given by the equation.
When an electric current passes through the coil, it deflects. Remember that the galvanometer doesn’t “hog” all the current if the current is a low value.
This is what I know so far. Where E is the e. Note that whatever current is flowing in the circuit being measured that the current will always split 3: 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 maximum current that the ammeter produced can measure is lets say I and shunt resistance is Rs. You understood this part wrong. Home Questions Tags Users Unanswered.
A galvanometer is a device used to detect feeble electric currents in a circuit. I understand why the shunt resistance has to ammete 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 voltmeted 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.
Ruqaiya Naeem 13 3.
The galvanometer coil has a moderate resistance about ohms and the galvanometer itself has a small current carrying capacity 1 mA. It can be converted into an ammeter by connecting a low resistance called shunt resistance in parallel to the galvanometer.
Now, a shunt resistance is added in parallel. What is figure of merit of a galvanometer? 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 galvanometee 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. Retrieved 1 Januaryfrom amrita. Maximum deflection occurs at Ig max. The current always splits inversely to the galvanomter of the reaistances. Ig is always passing through the galvanometer so how does the ammeter really work and give us current in amperes? Now Rs is of such a value that Ig passes through the galvanometer cinversion the remaining current I-Ig passes through the shunt resistance.