Anderson's Bridge
Anderson's bridge is a type of bridge circuit used for the precise measurement of inductance over a wide range. It is named after the American physicist Carl David Anderson, who developed this circuit.

Principle of Operation
Anderson's bridge is based on the principle of null measurement. The bridge circuit consists of four arms - three of them are resistive and the fourth arm contains the unknown inductor to be measured. The bridge is balanced by adjusting the variable resistors in the circuit until the galvanometer shows zero deflection.

Wide Range Measurement
One of the key advantages of Anderson's bridge is its ability to measure inductance over a wide range. By adjusting the values of the fixed resistors and the variable resistors in the circuit, the bridge can be used to accurately measure inductance values ranging from a few microhenries to several henries.

Precision Measurement
Anderson's bridge is known for its high precision in measuring inductance. The null measurement technique used in this bridge circuit allows for accurate and reliable readings, making it suitable for applications where precise inductance measurements are required.

Applications
Anderson's bridge is commonly used in laboratories, research facilities, and industrial settings for the precise measurement of inductance in various electronic circuits and devices. It is particularly useful in applications where the inductance value needs to be determined accurately over a wide range.
In conclusion, Anderson's bridge is a versatile circuit that offers precise and wide-ranging measurements of inductance. Its reliability and accuracy make it a valuable tool for engineers and researchers working in the field of electrical engineering.

Hay bridge is used