Question

State and prove Wheatstone bridge principle ?

Answer 1

Answer:

The Wheatstone bridge is a circuit which is used to measure accurately an unknown resistance.

PRINCIPLE: Wheatstone bridge principle states that when the bridge is balanced, the product of the resistance of the opposite arms are equal.

The files that I had attached in which I had derived Wheatstone bridge equation using Kirchhoff law is useful to you.

Answer 2

The Wheatstone bridge works on the principle of null deflection.

• For the measurement of the resistance the Wheatstone bridge is used.
• This type of bridge is made up of 4 resistors that are the arms of the bridge.
• The ratio of the two arms or resistors is a fixed value.
• Out of the remaining two resistors one resistor value is not known, and the other can be varied.
• P, Q, R, and S are the four resistors.
• "$\frac{P}{Q} = \frac{R}{S}$"
• "S= $\frac{P}{Q} R$" the not knowing resistance value S can be found by adjusting the value of R.

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