How can you extend range of ammeter and voltmeter?

1. There is no fundamental difference in the operating principles of ammeters and voltmeters.
2. It is possible to extend the range of an ammeter by using a shunt.
3. As seen from Figure, the voltage across the instrument coil and the shunt resistance is the same since.
4. Multipliers are used for the range extension of voltmeters.

Why do we need to extend the range of ammeter?

For example, a moving coil ammeter can measure currents 0-100mA. Thus it is impossible to measure high currents which are more than the measuring range of an instrument. Therefore, it is necessary to bring up these large currents to a value within the range of the instrument.

Can we increase or decrease the range of ammeter How?

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 can you increase the range of a voltmeter?

The range of voltmeter can be increased by connecting a suitable high resistors in series with it. 2. The range of a voltmeter can decreased by reducing its resistace. This can be done by putting a suitable resistance in parallel with the voltmeter.

What is the relation between the resistance to be connected to extend the range of ammeter and its internal resistance?

Thus a shunt resistance increases the range of the ammeter with the meter’s current, IG being proportional to the total circuit current IT producing the required voltage drop across the meter for full scale deflection.

What is the range of ammeter?

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

How the range of instrument can be extended in Pmmc instruments?

In ammeter by connecting a shunt resister In voltmeter by connecting a series resister.

How can current sensitivity of an ammeter can be increased?

Sensitivity of an ammeter can be increased by increasing the as available flux density.. This can be done by increasing the number of turns of the coil. If the area of winding is fixed, increase of number of turns can be done using thinner gauges of wire. However this increases the resistance of the winding.

How do we extend the range of electrostatic voltmeter?

By varying the resistance r of the portion to which an electrostatic voltmeter is connected, the range of the electrostatic meter can be extended.

Why do we need to extend the range of a voltmeter What is the relation between the resistance to be connected to extend the range of meter and its internal resistance?

Multipliers: The range of voltmeter can be extended by connecting a high resistance, called multiplier in series with the voltmeter (Figure 2(b)). The multiplier limits the voltage drop so that it does not exceed the value of full scale and thus prevents from being damaged.

What is the effect of the ammeter range on the shunt resistance?

8. What is the effect of the ammeter range on the shunt resistance? It is clear from the above equation that in order to increase the ammeter range by N times, the shunt resistance is equivalent to 1⁄N-1.

When an ammeter is shunted its measuring range?

When an ammeter is shunted then it provides the low resistance path. In order to increase the range of ammeter, the value of shunt resistance is decreased. When an ammeter is shunted then its measuring range will increase.