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.
| Table of Contents |
Difference Between Ammeter and Galvanometer
The galvanometer deflects the flow of current with the help of a moving coil which rotates between the permanent magnets and with the flow of current, deflection of the coil occurs. A galvanometer can be turned into an ammeter by parallelly connecting a resistance in the electric circuit. It can be used as a voltmeter when resistance is connected in series with it.
An ammeter is used to measure the magnitude of current. It is also called an ampere metre because ampere is the unit of current.
| Difference Between Ammeter and Galvanometer | |
|---|---|
| Ammeter | Galvanometer |
| It is a device used to determine the magnitude of current flowing in a circuit. | It is a device used to detect the strength and direction of a small current present in the circuit. |
| It works with or without the presence of the magnetic field. | It works due to the presence of the magnetic field. |
| It measures both alternating and direct current. | It measures only direct current. |
| It is less sensitive. | It is more sensitive. |
| It is more accurate. | It is less accurate. |
| It could be a mechanical or electronic device. | It is a mechanical device. |
| It is used in an electrical circuit. | It is used in bridges and potentiometers. |
To learn about galvanometer to ammeter conversion, click on the video below.
These were some differences between the ammeter and the galvanometer. If you wish to find out more, download BYJU’S – The Learning App.
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Frequently Asked Questions – FAQs
How does a galvanometer operate as an ammeter?
A galvanometer is used for measuring or for detecting small currents. But by converting a galvanometer into an ammeter, large currents can be detected. To convert a galvanometer into an ammeter, a low resistance known as shunt resistance is connected parallel to the galvanometer.
What is shunt resistance?
A resistor with a low value of resistance is known as shunt resistance. The material used in the shunt resistor is made from low temperature coefficient resistance.
What is the reduction factor?
A reduction factor is used in a tangent galvanometer which is equal to the current required to pass through the galvanometer so that there is a production of 45o deflection. The reduction factor is denoted by the letter K and is measured in ampere.
Why is the resistance of an ammeter maintained low?
The resistance of an ammeter is kept low because when the resistance range is kept at high values, the current passing through the circuit will decrease. Therefore, it is kept at low values.
Why is an ammeter always connected in series?
An ammeter is always connected in series because the internal resistance of an ammeter is low. If the ammeter is connected in parallel, there are high chances of a short circuit.
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