#### Wheatstone bridge equation

## What is Wheatstone bridge formula?

Wheatstone Bridge Formula Following is the formula used for Wheatstone bridge: R=frac{PS}{Q} Where, R is the unknown resistance. S is the standard arm of the bridge.

## How is Wheatstone bridge calculated?

The Wheatstone bridge is an electrical bridge circuit used to measure resistance. If the ratio of the two resistances R_{b} / R_{a} is equal to the ratio of the two R_{x} / R_{c}, then the voltage across bridge V_{b} will be zero.

## What is Wheatstone bridge and its application?

The Wheatstone bridge is used for measuring the very low resistance values precisely. Wheatstone bridge along with operational amplifier is used to measure the physical parameters like temperature, strain, light, etc.

## What is the condition of Wheatstone bridge?

The bridge is in balance condition when no current flows through the coil or the potential difference across the galvanometer is zero. This condition occurs when the potential difference across the a to b and a to d are equal, and the potential differences across the b to c and c to d remain same.

## Why is Wheatstone bridge more accurate?

(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.

## What is null point in Wheatstone bridge?

The main advantage in Wheatstone Bridge is that at null point current does not flow in arm of the galvanometer, so no effect of the resistance of galvanometer or no consumption of electric energy or potential across galvanometer. It is a convenient and easy method.

## What are the limitations of Wheatstone bridge?

Limitation of Wheatstone bridge: “It is not susceptible to high dc current.” “It may give inaccurate readings if not balanced.” “The Wheatstone bridge measures resistance from few “ohms” to “megohms.”

## What is the principle of meter bridge?

The meter bridge principle is based on the Wheatstone Bridge circuit which says that if at any point or length (of a wire), the ratio of two resistances (say R1 and R2) is equal to the ratio of another two resistances (say R3 and R4 where R4 is the unknown resistance), then there shall be no flow of current at that

## What is the use of Kelvin Double Bridge?

A Kelvin bridge, also called a Kelvin double bridge and in some countries a Thomson bridge, is a measuring instrument used to measure unknown electrical resistors below 1 ohm. It is specifically designed to measure resistors that are constructed as four terminal resistors.

## Who invented Wheatstone bridge?

Samuel Hunter Christie

## 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. This bridge is also called post office box.