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Transcript 
Direct Current Bridges

A Wheatstone bridge can be used to measure
resistance by comparing unknown resistor
against precision resistors of known value,


When the voltage between A and B is equal
zero .
Then the voltage for R1 is equal to the
voltage for R2
I1 R1 = I 2 R 2
(1)
I3 R3 = I4 R4
(2)

I Galvanometer is equal zero
then
I1 = I3 , I2= I4
Divide (1)/(I2 2)
(3)
or

Calculate the value of Rx if the bridge is
balanced

R1 Rx = R2 R3
We can calculate Vth and rth by the following:
* First Vth :
Using voltage Kirchhoff law
Vth =V1 − V2 = I1 R1 − I2 R2

=
 seconded rth

Calculate the current flowing through
Galvanometer in the figure bellow:
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