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Published byTyrell Leopard Modified over 2 years ago

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Direct Current Bridges

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A Wheatstone bridge can be used to measure resistance by comparing unknown resistor against precision resistors of known value,

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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)

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I Galvanometer is equal zero then I1 = I3, I2= I4 (3) Divide (1)/(I2 2) or

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Calculate the value of R x if the bridge is balanced

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R1 Rx = R2 R3

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We can calculate V th and r th by the following: * First V th : Using voltage Kirchhoff law Vth =V1 − V2 = I1 R1 − I2 R2 =

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seconded r th

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Calculate the current flowing through Galvanometer in the figure bellow:

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Kirchhoff’s laws. Apply Kirchhoff’s first and second laws. Calculate the current and voltage for resistor circuits connected in parallel. Calculate the.

Kirchhoff’s laws. Apply Kirchhoff’s first and second laws. Calculate the current and voltage for resistor circuits connected in parallel. Calculate the.

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