Measurement of Resistance using D.C. Bridges
One of the primary uses of D.C. bridges is for the measurement of resistance. D.C. bridges are electrical circuits that are designed to measure unknown resistance values by comparison with known standard resistors. There are various types of D.C. bridges such as Wheatstone bridge, Kelvin bridge, and Maxwell bridge, each with its specific application.

Working Principle
D.C. bridges typically consist of a circuit with four arms, where one arm contains the unknown resistance to be measured. By adjusting the values of the other three arms (known resistors), a balance point is achieved where no current flows through the galvanometer, indicating that the ratio of the resistances in the two arms is equal.

Accuracy and Sensitivity
D.C. bridges are known for their high accuracy and sensitivity in measuring resistance. The balance point obtained in the bridge circuit allows for precise determination of the unknown resistance value. This makes D.C. bridges a valuable tool in various electrical and electronic applications where accurate resistance measurements are required.

Applications
D.C. bridges find applications in industries such as telecommunications, electronics, and electrical engineering. They are used for quality control, calibration of instruments, material testing, and circuit analysis. D.C. bridges are essential in determining the resistance values of components in circuits, ensuring proper functionality and performance.
In conclusion, D.C. bridges are primarily used for the measurement of resistance due to their accuracy, sensitivity, and versatility in various applications within the field of electrical engineering.