What is Wheatstone bridge How can it be used to determine an unknown resistance?

A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit, one leg of which includes the unknown component.

Why is a Wheatstone bridge preferred for resistance measuring device?

(i) The Wheatstone bridge method is more accurate than the other methods of measuring resistances because it uses null method. Hence the internal resistance of the cell and resistance of galvanometer do not affect the null point.

Why must the Wheatstone bridge be an AC bridge instead of DC bridge?

The bridge which is used for measuring the unknown impedance of the circuit is known as the Wheatstone bridge. The DC bridge is used for measuring the unknown resistance of the circuit. The AC bridge uses the AC supply. In AC bridge the current is detected by using the AC detector.

Why Wheatstone bridge is called bridge?

Wheatstone bridge is an electric circuit and as the name suggests, it is in a shape of a bridge, the bridge is a galvanometer. It is named after Sir Charles Wheatstone who has popularized this. Wheatstone bridge helps in finding the unknown resistance value of a resistor.

Why is Wheatstone bridge used?

Wheatstone Bridge is used in applications where small changes in resistance are to be measured in sensors. This bridge is used to find the unknown resistance very precisely by comparing it with a known value of resistances. In this bridge, a Null or Balanced condition is used to find the unknown resistance.

What is Wheatstone bridge explain its use in detail?

Wheatstone bridge is an electrical circuit used to calculate an unknown resistance with the help of a bridge circuit. For this, the two legs of the bridge circuit are kept balanced and one leg of it includes the unknown resistance. It can be used in all electronic circuits.

What is Wheatstone bridge and explain?

Definition of Wheatstone bridge : an electrical bridge consisting of two branches of a parallel circuit joined by a galvanometer and used for determining the value of an unknown resistance in one of the branches.

How do we find the unknown values of resistance?

Just find the voltage of the known resistor w/ the ohmemeter, and use ohm’s law (i=v/r) to get the current, then use the current with the unknown r’s voltage & ohm’s law to get the resistance.

What is Wheatstone bridge when is the bridge said to be balanced?

A Wheatstone bridge is said to be in a balanced condition when no current flows through the galvanometer. This condition can be achieved by adjusting the known resistance and variable resistance.