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Wheatstone Bridge
Title: Wheatstone Bridge
Category: Science & Technology
Details: Words: 1425 | Pages: 6.1 (approximately 235 words/page)
Wheatstone Bridge
Direct Current Circuits
Out of Balance Wheatstone Bridge
INTRODUCTION:
The most accurate measurements of resistance are made with a galvanometer (or a voltmeter) in a circuit called a Wheatstone bridge, named after the British physicist Charles Wheatstone. This circuit consists of three known resistances and an unknown resistance connected in a diamond pattern. A DC voltage is connected across two opposite points of the diamond, and a galvanometer is bridged across the other two points. …showed first 75 words of 1425 total…
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…showed last 75 words of 1425 total…varying the value of one of the known resistances, the bridge can be made to balance for any value of unknown resistance, which can then be calculated from the values of the other resistors. In theory, if one arm of an originally balanced equal-arm Wheatstone Bridge is changed from R to R + ∆R, the bridge voltage will be given by:
V0 = (Vs/4) x (∆R/R) = (Vs/4R) x ∆R
This is true if ∆R/R
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