How to convert a galvanometer to ammeter?
Since, an ammeter must have very less resistance. So, a galvanometer can be converted into an ammeter by connecting a very small shunt resistance in parallel with the galvanometer resistance.
How will you convert galvanometer to voltmeter?
By joining a high resistance in series with the coil of galvanometer. It can be converted into voltmeter. Was this answer helpful?
How will you convert moving coil galvanometer into ammeter and voltmeter?
A moving coil galvanometer can be converted into an ammeter by connecting a low resistance (called a shunt) in parallel to the galvanometer. A moving coil galvanometer can be converted into a voltmeter by connecting a high resistance in series with the galvanometer.
How galvanometer is acting as an ammeter?
The correct answer is A low resistance in parallel. Explanation: We can convert a Galvanometer into an ammeter by connecting a low resistance in parallel.
How is ammeter connected to galvanometer?
The ammeter must have a low resistance so that it does not affect the current flowing through it. To detect the circuit current, an ammeter is arranged in series. By interconnecting a low resistance in parallel well with a galvanometer, an ammeter is created. Such low resistance is referred to as shunt resistance S.
Why do we use a shunt to convert a galvanometer into an ammeter?
Since galvanometer is a very sensitive instrument that cannot measure heavy currents in order to convert a galvanometer into ammeter we have to put a low resistance called shunt in parallel to it so that most of the current goes through it , and our device can measure the accurate value.
What is the formula for galvanometer?
The figure of merit of galvanometer formula is: Ig = nk or k = Ig/n,is the required figure of merit of galvanometer formula. The final result of the experiment: We found that there is a minute difference in the value of the actual and the measured one and the conversion is seemingly perfect.
How to convert voltmeter into ammeter?
When you connect a very high resistance in series with the galvanometer it gets converted to voltmeter. So to convert voltmeter into an ammeter you need to connect an small resistance in parallel with it, removing the high resistance, then the system will get converted into an ammeter..
How to convert galvanometer into ohmmeter?
An ohmmeter can be created by putting a fixed resistor, a variable resistor, and galvanometer in series with one another. To calibrate the galvanometer, the fixed and variable resistor values must be chosen such that the current is equal to the full-scale deflection of the galvanometer.
Why is the galvanometer not used directly as an ammeter?
The reason for galvanometer to be not used to measure current: The galvanometer is a very sensitive device. For a small amount of current, the galvanometer deflection will be maximum. Hence, it may get damaged when a strong current is passed through the galvanometer.
What is the formula for ammeter?
The formula for the ammeter: The relationship between the current and the resistance in an electric circuit is given by Ohm’s law as: I = V / R Where is the current through the circuit , is the voltage and is the resistance of the circuit.
How can you convert galvanometer into ammeter?
A galvanometer is converted into an ammeter by connecting a low resistance in parallel with the galvanometer. This low resistance is called shunt resistance S. The scale is now calibrated in ampere and the range of ammeter depends on the values of the shunt resistance.
What is the difference between an ammeter and a galvanometer?
The major difference between an ammeter and a galvanometer is that an ammeter shows only the magnitude of the current, while a galvanometer shows both the direction and magnitude of the current.
What is the principle and working of galvanometer?
Principle of working of a Galvanometer: It works on the principle of torque acting on a current carrying coil inside a magnetic field. The torque acting on this coil is directly proportional to the magnitude of electric current flowing in it.
How to convert galvanometer to voltmeter?
When we convert the galvanometer into a voltmeter, we use a high-resistance multiplier and connect it with the galvanometer. This is done to lower the voltage passing through the resistance. This voltage should stay below the maximum capacity of voltage the galvanometer can handle.
What is galvanometer and how it is converted into ammeter and voltmeter?
A galvanometer is converted into a voltmeter by connecting a high resistance ′R′ in series with it. A galvanometer is converted into ammeter by connecting a small resistance (called shunt) in parallel with it.
How is moving coil galvanometer connected into ammeter?
A galvanometer can be converted into an ammeter by connecting a low resistance (called shunt resistance) in parallel to the galvanometer. Parallel resistance being small will draw most of the current and the combination will not effect the original current in the circuit.
When converting a galvanometer into an ammeter the shunt should have?
To convert a galvanometer into an ammeter a small resistance S (called the shunt) is connected in parallel with a galvanometer. A galvanometer has resistance G and full scale deflection current i. To convert this galvanometer into an ammeter of range 10 i, a shunt S=G9 is connected in parallel with G.
How is a galvanometer like an ammeter in that it measures current?
A Galvanometer is a device used to measure small electric currents, while an Ammeter is used to measure larger electric currents.
What is the least count of galvanometer converted into ammeter?
However the galvanometer could be converted into an ammeter which can measure up to microampere current. Hence, the least count of ammeters made from the galvanometer is $0.1\mu m$.
Why does an ammeter need a shunt?
An ammeter shunt creates a very low-resistance connection between two points in an electric circuit. The electricity needs somewhere to go with this resistance so there is an alternative path for a portion of current to flow.
How to use a galvanometer to measure current?
Current in a circuit can be measured by placing a galvanometer in the circuit. The current passes through the galvanometer, deflecting the pointer and giving the current in amps.
What is the relationship between galvanometer and shunt?
The Galvanometer is converted into Ammeter by connecting the shunt resistance parallel in a circuit of series connection. Since the Galvanometer cannot measure larger currents, the galvanometer is converted into ammeter using the shunt resistor to measure the larger voltage.
Is a galvanometer AC or DC?
Galvanometer functions both with and without the presence of a magnetic field. Ammeter functions due to the presence of a magnetic field. Galvanometer can measure both AC and DC. Ammeter can measure only DC.
What is the difference between galvanometer and ammeter?
An ammeter is a device that is used to measure the magnitude of an electric current which flows through a circuit. Whereas, a galvanometer is a device that detects the direction and strength of a modest current that is flowing across a circuit.
Why can’t a galvanometer be used to measure current?
No, a galvanometer as such can not be used for measuring current as it is a very sensitive instrument as it shos full scale deflection even for a very small current.
How to use a galvanometer to measure current?
Current in a circuit can be measured by placing a galvanometer in the circuit. The current passes through the galvanometer, deflecting the pointer and giving the current in amps.
How to convert voltmeter to ammeter?
When you connect a very high resistance in series with the galvanometer it gets converted to voltmeter. So to convert voltmeter into an ammeter you need to connect an small resistance in parallel with it, removing the high resistance, then the system will get converted into an ammeter..
Why do we use a shunt to convert a galvanometer into an ammeter?
Since galvanometer is a very sensitive instrument that cannot measure heavy currents in order to convert a galvanometer into ammeter we have to put a low resistance called shunt in parallel to it so that most of the current goes through it , and our device can measure the accurate value.
How do you convert galvanometer to Ohm meter?
An ohmmeter can be created by putting a fixed resistor, a variable resistor, and galvanometer in series with one another. To calibrate the galvanometer, the fixed and variable resistor values must be chosen such that the current is equal to the full-scale deflection of the galvanometer.
How to convert a galvanometer into an ammeter?
What is the difference between a galvanometer and an ammeter?
How a galvanometer is connected in series?
How to convert galvanometer to voltmeter?
Let’s talk about turning a galvanometer into an ammeter. It’s a super cool thing to do, and it’s actually pretty straightforward. Think of it like this: a galvanometer is like a super sensitive current detector, but it only works with tiny amounts of current. An ammeter, on the other hand, is built to handle much larger currents. So, how do we make a galvanometer measure more current? Well, we have to shunt it!
The Shunt: A Key Component
The shunt is a low resistance wire that we connect in parallel with the galvanometer. Think of it as a detour for the current. Since it’s got a low resistance, most of the current will choose to flow through the shunt, leaving just a small portion for the galvanometer. And that’s exactly what we want! By controlling the amount of current that goes through the shunt, we can adjust the range of the ammeter.
Understanding the Relationship between Shunt Resistance and Current
Now, let’s dive into the math behind the shunt. We’re going to use Ohm’s Law here, which says that voltage (V) equals current (I) times resistance (R). You might be familiar with it as V = IR.
* The Original Galvanometer: First, we need to figure out the maximum current (Ig) that the galvanometer can handle without getting damaged. This is called the full-scale deflection current. This value is usually provided in the galvanometer’s specifications. Let’s say our galvanometer has a full-scale deflection current of 1 mA (0.001 A).
* The Shunt: Now, let’s say we want to build an ammeter that can measure up to 1 A of current. The difference between these two values (1 A – 0.001 A = 0.999 A) will go through the shunt.
* Ohm’s Law to the Rescue: We know that the voltage across the galvanometer and the shunt must be the same (because they’re connected in parallel). So, we can use Ohm’s Law to find the resistance (Rs) of the shunt:
* V = Ig * Rg (where Rg is the galvanometer resistance)
* V = (I – Ig) * Rs
* Since the voltage is the same for both, we can set the equations equal to each other:
Ig * Rg = (I – Ig) * Rs
* Now, we can rearrange to solve for the shunt resistance:
Rs = (Ig * Rg) / (I – Ig)
* Example: If our galvanometer has a resistance of 100 ohms, we can plug the numbers in:
Rs = (0.001 A * 100 ohms) / (1 A – 0.001 A) ≈ 0.1 ohms
So, we need a shunt with a resistance of about 0.1 ohms to create an ammeter that can measure up to 1 A.
Creating the Ammeter
Now that we understand the shunt and how to calculate its resistance, we can actually build our ammeter. Here’s how:
1. Get a Galvanometer: Make sure you know its full-scale deflection current (Ig) and resistance (Rg).
2. Calculate the Shunt Resistance: Use the formula we derived earlier to find the shunt resistance (Rs).
3. Choose a Shunt Wire: The shunt should be made of a material with a low resistance, like copper or manganin. The wire’s diameter and length will determine its resistance. You can use a wire gauge chart to find the right wire for your shunt.
4. Connect the Shunt: Connect the shunt in parallel with the galvanometer. Make sure the connections are secure and have a low resistance.
5. Calibrate the Ammeter: To calibrate the ammeter, you can use a known current source. Adjust the scale of the ammeter to match the current you’re measuring.
6. Label the Ammeter: Label the ammeter with its range and other necessary information.
Tips for Choosing a Shunt
* Current Range: The shunt resistance should be chosen based on the desired current range of the ammeter. A lower shunt resistance will allow for a higher current range.
* Power Dissipation: The shunt will dissipate some power as heat. Make sure the wire can handle this heat. You can calculate the power dissipation using the formula P = I2 * Rs.
* Temperature Coefficient: The resistance of the shunt wire will change with temperature. Choose a material with a low temperature coefficient to minimize this effect.
FAQ’s
1. Can I use a resistor instead of a shunt?
Yes, you can use a resistor, but it’s important to note that the resistor will dissipate more power than a shunt. This is because a resistor is designed to resist the flow of current, while a shunt is designed to allow current to flow through it easily.
2. How do I determine the maximum current my ammeter can handle?
The maximum current that your ammeter can handle is determined by the maximum current that the galvanometer can handle and the resistance of the shunt. It’s important to choose a shunt that can handle the maximum current you expect to measure.
3. How accurate is an ammeter made from a galvanometer?
The accuracy of an ammeter made from a galvanometer depends on the accuracy of the galvanometer and the shunt. It’s also important to make sure that the connections are secure and have a low resistance.
4. What are some common applications for ammeters?
Ammeters are used in a wide variety of applications, including:
* Electrical circuits: To measure the current flowing through a circuit.
* Automotive applications: To measure the current drawn by the starter motor, alternator, and other components.
* Industrial applications: To measure the current in electric motors, generators, and other heavy-duty equipment.
5. Are there any other ways to convert a galvanometer into an ammeter?
Yes, there are other ways to convert a galvanometer into an ammeter. For example, you can use a current transformer to reduce the current before it reaches the galvanometer. However, the shunt method is the most common and straightforward way to convert a galvanometer into an ammeter.
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