Physics Practicals Class 12

# Conversion of Galvanometer to Ammeter

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• In this simulation, you will learn the theory behind the conversion of a galvanometer into an ammeter.
• You will learn about shunt resistance to be connected to a galvanometer.
• You will measure the current and resistance of the galvanometer.
• This interaction provides a very immersive environment and gives you a real-lab-like experience while conducting or performing experiments.
• All the experiment steps and procedures, like connecting wires, noting down the readings, varying galvanometer, and ammeter deflections, etc., and many more, are highly interactive and have been simulated in a very similar manner as you do in a physics lab. • It is one of the important class 12 physics practicals that you can learn in our virtual lab.
• This will help learners to better prepare for various competitive exams such as IIT-JEE (JEE Main & Advanced), NEET, and Olympiads.

### Simulation Details

Duration – 30 Minutes
Easily Accessible
Language – English
Platforms – Android & Windows

Description

An ammeter is a device that measures the amount of current flowing through an electrical circuit. The ammeter must have a low resistance so that the current travelling through it remains unaffected. To measure the circuit current, an ammeter is connected in series.

An instrument called a galvanometer is used to find weak electric currents in a circuit. Although the galvanometer itself has a tiny current-carrying capability, the galvanometer coil has a moderate resistance of roughly 100 ohms (1 mA).

Only little currents may be detected by a galvanometer. As a result, it is transformed into an ammeter to measure enormous currents. By joining a low resistance known as a shunt resistance in parallel to the galvanometer, it may be transformed into an ammeter.

If 𝐺 is the galvanometer’s resistance and 𝐼𝑔 is its full-scale deflection current, then the shunt resistance needed to transform galvanometer into an ammeter with a range of 0 to 𝐼 ampere is, $$S=\frac{I_g \times G}{I-I_g}$$

𝐼𝑔 is calculated using the equation, 𝐼𝑔 = 𝑁𝑘, where 𝑁 is the number of divisions on the galvanometer and 𝑘 is the figure of merit of galvanometer.

Let 𝑙 be the length of the resistance wire required for a resistance of 𝑆 ohm, $$l=\frac{\pi r^2 S}{\rho}$$

where, 𝑟 is the radius of the wire and 𝜌 is the resistivity of the material of the wire.

### Requirements for this Science Experiment

Galvanometer Ammeter Rheostat Battery Eliminator Plug Key

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