# Short-Questions

Fast solutions for complex problems

## How do you increase the range of a voltmeter?

To increase the range of a voltmeter

1. a low resistance in series is connected with the voltmeter.
2. a low resistance in parallel is connected with the voltmeter.
3. a high resistance in series is connected with the voltmeter.
4. a high resistance in parallel is connected with the voltmeter.

How can we increase or decrease range of ammeter?

A galvanometer can be converted into an ammeter by using a low resistance wire in parallel with the galvanometer. The range of ammeter can be increased but cannot be decreased. The reason is that a series resistor cannot change the current that will produce full deflection.

### How do you increase ammeter reading?

The ammeter reading is increased when a thicker wire of the same material and of the same length is used in the circuit. A change in ammeter reading is observed in a wire of different material of the same length and same area of cross section is used.

What is the range of voltmeter and ammeter?

It is not possible to decrease the range of an ammeter. However, it can be increased by connecting a shunt (or low resistance) in parallel with the Ammeter. A voltmeter can have a maximum range of 0-20 V.

#### Can we increase the range of ammeter?

So to increase the range of ammeters we should have to connect low resistance in parallel so that equivalent resistance is lower hence to increase range of an ammeter we need to connect a suitable low resistance in parallel.

How can we reduce the range of a voltmeter?

We can decrease the range of the given voltmeter by putting a suitable resistance in parallel with the high resistance already in series with the galvanometer working as voltmeter, so that the effective resistance of the voltmeter multiplied with the current (Ig) gives the required potential difference to be measured …

## How do you change the range of an ammeter?

It is possible to extend the range of an ammeter by using a shunt. A shunt is a low-value resistance having minimum temperature co-efficient and is connected in parallel with the ammeter whose range is to be extended. The combination is connected in series with the circuit whose current is to be measured.

How can the range of a clamp on ammeter be increased?

The range of an ammeter can be easily increased by adding a shunt resistance of very low value to bypass the major part of the current through the resistance path instead of ammeter. This increases the range of an ammeter by reducing the actual current flow through the ammeter.

### What is A very sensitive ammeter called?

Picoammeter. A picoammeter, or pico ammeter, measures very low electric current, usually from the picoampere range at the lower end to the milliampere range at the upper end. Picoammeters are used where the current being measured is below the limits of sensitivity of other devices, such as multimeters.

How do you solve an ammeter?

V=IR, here V is the potential difference across a resistance R through which a current I is flowing. The ammeter is connected in series with the circuit. So its reading will show the value of the current flowing in the circuit. Hence, the reading of the ammeter is equal to 1A.

#### What is ammeter range?

Ammeter ranges are created by adding parallel “shunt” resistors to the movement circuit, providing a precise current division. Shunt resistors can be used in conjunction with high-resistance voltmeters as well as low-resistance ammeter movements, producing accurate voltage drops for given amounts of current.

What is range of given ammeter?

An ammeter has a range of 0-3 ampere and there are 30 divisions on its scales.

## What can be used to extend the range of an ammeter?

Therefore, it becomes necessary that the current and voltage being measured be reduced and brought within the range of the instrument. There are four common devices used for the range extension of ammeter and voltmeter namely; shunts, multipliers and current and potential transformers.

How is the range of measurement of a voltmeter changed?

The range of measurement of current can be changed by changing the shunt resistance. The range of measurement of P.D. of voltmeter can be changed by changing the high-value resistance in the series. To measure a larger current, a shunt of smaller value is required.

### How does a shunt affect the range of an ammeter?

Due to the shunt, the effective resistance of the ammeter will be very low. Shunt increases the range of measurement of the current by the galvanometer and hence the range of ammeter is increased. Shunt protects the galvanometer coil from being damaged due to the excess flow of current. A sensitive moving coil galvanometer (pivoted type) is taken.

How are multipliers used for range extension of voltmeters?

Extension of Range of Voltmeter by Multipliers Multipliers are used for the range extension of voltmeters. The multiplier is a non-inductive high-value resistance connected in series with the instrument whose range is to be extended. The combination is connected across the circuit whose voltage is to be measured.