Electronic Bridges

 If the electrical components are arranged in the form a bridge or ring structure, then such electrical circuit is called a bridge. In general, bridge forms a loop with a set of four branches or arms. Each branch contains one or two electrical components.

 Types of Bridges

 The two Types of bridges are

1. D.C Bridges

2. A.C Bridges

The D.C bridges are used to measure the unknown resistance while the A.C bridges are used to measure the impedances consisting capacitance and inductances. The D.C bridges use the D.C voltages as the excitation voltage and the A.C bridges use the alternating voltage as the excitation voltage.

 

AC Bridges:

The bridge uses for measuring the value of unknown resistance, inductance and capacitance, is known as the AC Bridge.

AC bridges operate with only AC signal.

 

Types of AC Bridges:

 

AC Bridges

Uses
  1. Capacitance Comparison Bridge

Used for the measurement of unknown capacitance.
  1. Inductance Comparison Bridge

Used to determine the unknown resistance and inductance values.
  1. Maxwell’s Bridge

Used for the measurement of self-inductance of the electrical circuit.
  1. Hay’s Bridge

Used to measure the unknown resistance & inductance of coils with high Q-factor.
  1. Anderson Bridge

Used to measure the self-inductance of the coil.
  1. Schering Bridge

Used for measuring an unknown value of capacitance and its dissipation factor.
  1. Wein Bridge

Used for determining the value of unknown frequency.

 

DC Bridges:

DC bridges which can be operated with only DC voltage signal. DC bridges are used for measuring the value of unknown resistance, which is present in the bridge.

 

Types of DC Bridges:

  1. Wheatstone Bridge:

The Wheatstone Bridge is used for measuring the very low resistance values precisely.

  1. Kelvin Bridge:

The Kelvin Bridge is used for measuring the unknown resistances having a value less than 1Ω. It is the modification of the Wheatstone Bridge.

 

Comparison between AC Bridges & DC Bridges:

 

AC Bridges

DC Bridges

Definition

The bridge which is used for measuring the value of unknown impedance is known as the AC bridge.

The DC bridge measures the unknown resistance of the electrical circuit.

Supply

AC supply is used

DC supply is used

Current Detector

AC Detector

DC Detector

Components

Resistive and Reactive

Resistive

Balancing Time

Relatively less

High

Types Of Bridges

1.Capacitance Comparison Bridge

2.Inductance Comparison Bridge

3.Maxwell’s Bridge

4.Hay’s Bridge

5.Anderson Bridge

6.Schering Bridge

7.Wein Bridge

1. Wheatstone bridge

2. Kelvin Bridge

 


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