What is Wheatstone Bridge?
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Wheatstone bridge, also known as the resistance bridge, is the setup that is used for measuring the unknown resistance. It was invented by Samuel Hunter Christie in 1833 and was later popularised by Sir Charles Wheatstone in 1843.
A Wheatstone bridge comprises four arms which are termed as resistors, and among which the ratio of two resistors is kept at a fixed value and the two arms left, that is, the remaining arms are balanced, one of them can be varied while the other arm is an unknown resistor.
Then through the method of balancing or null condition, the unknown resistance is calculated. The circuit of the Wheatstone bridge provides the exact measurement of the resistance. There are many variations of the Wheatstone bridge that are utilised for the AC circuits.