## For what purpose Wheatstone bridge is used?

The Wheatstone bridge is used for the precise measurement of low resistance. Wheatstone bridge along with operational amplifier is used to measure physical parameters such as temperature, light, and strain.

**What is Wheatstone bridge experiment?**

The circuit known as a Wheatstone bridge is most commonly used to determine the value of an unknown resistance to an electrical current. The unknown resistance can be identified by studying and manipulating the path of the current take through the Wheatstone bridge grid.

**On which principle does Wheatstone bridge work?**

null deflection

Wheatstone Bridge Principle It works on the principle of null deflection, which means the ratio of their resistances are equal and hence no current flows through the circuit. Under normal conditions, the bridge will be in the unbalanced condition where current flows through the galvanometer.

### What is the balance equation of Kelvin Bridge?

The ratio p/q is made equal to P/Q. Under balance conditions there is no current through the galvanometer which means that the voltage drop between a and b, Eab is equal to voltage drops Eamd between a and c. Eq (2) is the usual working equation for the kelvin bridge.

**Why is Wheatstone bridge more accurate?**

A Wheatstone’s bridge is more accurate than the other methods of measuring resistance because the resistance is obtained using the null method and is based on Kirchoff’s law. If one or more of the four resistances are changed, the current through the galvanometer becomes zero.

**What is the function of commutator in meter bridge?**

A commutator is a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. It consists of a cylinder composed of multiple metal contact segments on the rotating armature of the machine.

#### 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 are the application of meter bridge?**

The metre bridge is a device which is a practical application of Wheatstone bridge used for measuring an unknown resistance and for comparing two unknown resistances. Potentiometer is a three terminal resistor with sliding or moving contact. It provides resistance/opposition to the flow of current current.

**How is the Wheatstone bridge used in science?**

The Wheatstone bridge is used for the precise measurement of low resistance. Wheatstone bridge along with operational amplifier is used to measure physical parameters such as temperature, light, and strain. Quantities such as impedance, inductance, and capacitance can be measured using variations on the Wheatstone bridge.

## Can a Wheatstone bridge circuit be used in strain gage?

Below, the Wheatstone bridge circuit will only be considered with respect to its application in strain gage technique.

**How many resistors are in a Wheatstone bridge?**

The Wheatstone Bridge Circuit comprises two known resistors, one unknown resistor and one variable resistor connected in the form of a bridge. This bridge is very reliable as it gives accurate measurements. Wheatstone Bridge Construction Wheatstone Bridge Working Principle Wheatstone Bridge Formula Wheatstone Bridge Applications & Limitations

**Are there any limitations to the Wheatstone bridge?**

Along with all these advantages, there are a few limitations of the Wheatstone bridge as well, such as: Readings may be inaccurate under unbalanced conditions. The range of measured resistance varies from a few ohms to megaohms. Susceptibility for high dc current is not there.