Wheatstone Bridge Formula

Wheatstone Bridge Circuit diagram is as shown in the picture below

R3 = Adjustable Resistance
Wheatstone Bridge Circuit diagram

R1 and R2 are known Resistances

Rx = Unknown Resistance

G = Galvanometer connected between Q and S

Battery connected between P and R terminals

I(1)= current that passes through R1 and R2

I(2) = current that passes through R3 and Rx

Considering the loop PSQP



Considering the loop RQSR



From the first loop



From second loop



Hence to find the unknown resistance





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