# lecture06 - Lecture #6 ANNOUNCEMENT Check the Master...

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Lecture 6, Slide 1 EECS40, Fall 2003 Prof. King Lecture #6 ANNOUNCEMENT • Check the Master Schedule posted online for updated information on TA sections & office hours OUTLINE • The Wheatstone bridge circuit • Delta-to-Wye equivalent circuits • Node-voltage circuit analysis method Reading Finish Chapter 3, Chapter 4.1-4.2 Lecture 6, Slide 2 EECS40, Fall 2003 Prof. King The Wheatstone Bridge • Circuit used to precisely measure resistances in the range from 1 to 1 M , with ±0.1% accuracy ± R 1 and R 2 are resistors with known values ± R 3 is a variable resistor (typically 1 to 11,000 ) ± R x is the resistor whose value is to be measured + V R 1 R 2 R 3 R x current detector battery variable resistor

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Lecture 6, Slide 3 EECS40, Fall 2003 Prof. King Finding the value of R x • Adjust R 3 until there is no current in the detector Then, + V R 1 R 2 R 3 R x R x = R 3 R 2 R 1 Derivation : i 1 = i 3 and i 2 = i x i 3 R 3 = i x R x and i 1 R 1 = i 2 R 2 i 1 R 3 = i 2 R x KCL => KVL => R 3 R 1 R x R 2 = i 1 i 2 i x i 3 Typically, R 2 / R 1
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## This note was uploaded on 08/23/2009 for the course EECS 40 taught by Professor Chang-hasnain during the Fall '08 term at University of California, Berkeley.

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lecture06 - Lecture #6 ANNOUNCEMENT Check the Master...

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