Why is wheat stone bridge unsuitable for measurement of low resistance?

Why is wheat stone bridge unsuitable for measurement of low resistance?

Answer: Low Resistance: Wheatstone Bridgecan not be used to measure lowresistance because then the wireresistance and lead resistance come into the picture and affect the result. High Resistance: In wheatstone bridge, one balance the bridge by nullifying the deflection of the galvanometer.

Why Carey Foster bridge is better than Wheatstone bridge?

Carey Foster Bridge Advantages The Carey Foster bridge is a modified form of the meter bridge in which the effective length of the wire is considerably increased by connecting a resistance in series with each end of the wire. This increases the accuracy of the bridge.

Why Wheatstone bridge is called meter bridge?

The reason why this bridge is called as Meter Bridge is because of the fact that it works on the Wheatstone bridge’s principle. So, people also popularly call it as Wheatstone’s meter bridge. Another thing is that the wire length used in this circuit is of 1 meter, so it has got its name as a meter bridge.

What are the difficulties associated with wheat stone bridge for measuring medium range resistance?

Errors in Wheatstone Bridge The galvanometer is less sensitive. Thus, inaccuracy occurs in the balance point. The resistance of the bridge changes because of the self-heating which generates an error. The thermal emf cause serious trouble in the measurement of low-value resistance.

Which stone bridge is not suitable for measurement of?

Wheatstone bridge is not suitable for the measurement of resistance of the order of. Wheatstone bridge is not suitable for the measurement of very low and very high resistances of the order of mega-ohm.

Which stone bridge is suitable for the measurement of?

Explanation: Wheatstone bridge is the simplest form of bridge circuit. It is basically used for the measurement of medium resistances in the range of 1Ω to a few megaohms. Explanation: Wheatstone bridge is used to measure the d.c. resistance of various types of wires for controlling the quality of the wires.

Which principle is followed by Carey Foster bridge?

The Carey foster bridge principle is simple and similar to Wheatstone’s bridge working principle. It works on the principle of null detection. That means the ratios of the resistances will be equal and the galvanometer records zero where there is no current flow.

On what factors do the sensitivity & accuracy of a Carey Foster’s bridge depend?

The bridge is balanced when the two pairs of resistances connected to the galvanometer bear the same ratio. This can happen even when all the four Resistances are not of the same order. It can be proved that the bridge is most sensitive when all the four Resistances are of the same order.

Why instrument is known as meter bridge?

Hi, A meter bridge works on the principle of Wheatstone’s network and is known as Wheatstone’s meterbridge. The length of the wire used is one meter, so it is called meterbridge.

What are the uses of metre bridge in lab?

The meter bridge is an apparatus used in laboratories to find the resistance of a metal coil (or any other substance).

Why meter bridge is not suitable?

metre bridge is not suitable for both very high/low resistances..and the reason is as follows… If we measure too high resistance and the meter deflection is too small, ie, currents are too low. For Too low and you get errors due to the resistance of the wire and the connections.

Why is meter bridge not suitable?

The meter bridge is sensitive when the resistance of all four arms of the bridge are off the same order. It is so far moderate resistance only the meter bridge becomes insensitive for too high or too low values of resistances. For Too low and you get errors due to the resistance of the wire and the connections.

How is meter bridge used in wheat stone bridge experiment?

The meter bridge experiment uses the wheat bridge experiment to demonstrate the resistance of an unknown conductor or to make a comparison between two unknown resistors. Through the above-stated equation, one can easily decipher the specific resistance of a given material Conclusions of the wheat stone bridge principle are:

Can a Wheatstone bridge be used to measure low resistance?

Low Resistance: Wheatstone Bridge can not be used to measure low resistance because then the wire resistance and lead resistance come into the picture and affect the result. Suppose a low resistance is 1 ohm and lead resistance is 0.02 ohm and then it’s already 2% error.

What was the purpose of the Wheatstone bridge?

Sir Charles Wheatstone in 1843 after which it became popular. A Wheatstone bridge is an electrical circuit used to measure an unknown resistance value by maintaining a balance between two legs of a bridge circuit.

How is a LDR used in a Wheatstone bridge?

It is one of the simplest applications of the Wheatstone bridge using the photoresistive device. A light dependent resistor is placed in the place of the unknown resistor in the Wheatstone bridge. An LDR which is a passive resistive sensor is used for converting visible light levels into a change in resistance and afterward a voltage.