Physics Practicals Class 12

# Conversion of Galvanometer to a Voltmeter

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### About Simulation

• In this simulation, you will learn the theory behind the conversion of galvanometer to voltmeter experiment included in physics practicals class 12.
• You will learn about the series resistance to be connected to the galvanometer.
• You will measure the full-scale deflection current and the resistance of the galvanometer.
• All the experiment steps and procedures like connecting of wires, noting down the readings, varying galvanometer and voltmeter deflections, etc. and many more are highly interactive and have been simulated in a very similar manner as you do in a physics lab.

• This interaction provides a very immersive virtual lab environment and gives you a real-lab-like experience while conducting or performing experiments.
• 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

### Voltmeter

A voltmeter is a device used to measure the potential difference between two points in an appliance. A voltmeter is always connected in parallel to the appliance.

### Conversion of Galvanometer into Voltmeter:

Due to the low resistance of the galvanometer (𝐺), current flows through it, and it cannot measure the potential difference between any two points in an appliance. But we can convert the galvanometer to a voltmeter by connecting a high resistance of suitable value in series with a galvanometer.

### Circuit Diagram:

A voltmeter must be connected in parallel across the points where a potential difference is to be measured. If a galvanometer is used to measure voltage, it draws some current due to its low resistance.

If a galvanometer shows a full-scale deflection for a maximum current 𝐼𝑔,

$$𝐼𝑔 = 𝑁k$$

where,
𝑁 − Number of divisions on either side of zero of the galvanometer scale
𝑘 − Figure of merit of galvanometer

The potential difference across the galvanometer is 𝐼𝑔𝐺. If the converted galvanometer is desired to have a range 𝑉0 volt, The value of the resistance 𝑅 to be joined in series with the galvanometer is given by

$$R=\frac{V_0}{I_g}-G$$

### Requirements for this Science Experiment

Voltmeter Galvanometer Connecting Wires Resistance Box Plug Key

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