Question

The 4 resistor's 20ohm,40ohm,(20+x)ohm,80ohm respectively form a Wheatstone bridge.Find the value of X?

Answer 1

Answer:

Principle of Wheatstone bridge is that:

Resistance in the first arm/Resistance in the second arm = Resistance in the third arm/Resistance in the fourth arm.

According to your question,

R1= 20

R2=40

R3=20+x

R4=80

So

20/40 = 20+x/80

20+x = 40

Therefore x = 20

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