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## Class 12 Physics (India)

### Course: Class 12 Physics (India)>Unit 3

Lesson 11: Wheatstone bridge

# Wheatstone bridge & its logic

Wheatstone bridge is a special circuit consisting of 5 resistors. When the resistances in the adjacent arms have the same ratio, no current flows through the middle resistor! This is called a balanced Wheatstone bridge. It's used in calculating unknown resistances using a meter-bridge set up. Created by Mahesh Shenoy.

## Want to join the conversation?

• What would the practical applications be for this type of circuit?

I just can't see how it would be useful in real life

I understand that it makes life easier for everyone with less math to do, but I don't think anyone will be wasting resistors to make wheatstone's bridges
• You use this in cars for air pressure calculations in the air manifold system, for example.
(1 vote)
• I have a not-so-good doubt- can't the 5 ohm and the 1 ohm resistor be parallel?
• No, because of the resistor in the middle of them. One of the properties of parallel-connected resistors is that the voltage on both of them is the same but here it is not the case because of the extra resistor in the middle.
(1 vote)
• Can we apply the properties of a balanced wheatstone bridge even if the resistors in the diagram (original) are replaced with capacitors? If so, why?
(1 vote)
• At this is Wheatstone bridge....