Wheatstone

Wheatstone - EC4 Wheatstone Bridge In this lab you will...

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EC4 Wheatstone Bridge In this lab you will accomplish the following tasks: 1. Become familiar with the use of the Wheatstone ridge bridge 2. Use the DC Wheatstone bridge to measure a resistance 3. Use the AC Wheatstone bridge to measure a resistance (page 1)

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R 3 G I R X A B D The arrangement of four resistors shown in the figure is known as the “Wheatstone bridge” R 1 R 2 C We monitor the current I through branch DC of the bridge using the galvanometer G. ( A very ensitive ammeter is known as a “galvanometer” ) E sensitive ammeter is known as a galvanometer ) y varying R R and R e can make the potential at point C be equal to By varying R 1 , R 2 , and R 3 we can make the potential at point C be equal to the potential at point D i.e. V C = V D . When this condition is satisfied then the current I = 0 and thus the reading the of galvanometer is zero. We say that “the bridge is balanced”. 2 R R R = When I = 0 the four resistors satisfy the equation: 13 d o w n 1u p 3 VV I R I R =⇒ = 3 1 X R 2d o w n
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This note was uploaded on 02/20/2010 for the course PHY 152 taught by Professor Brewer during the Spring '08 term at SUNY Buffalo.

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Wheatstone - EC4 Wheatstone Bridge In this lab you will...

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