Lecture10 - Chapter 3

Lecture10 - Chapter 3 - EE216 C ircuit Analysis I Le cture#...

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1 EE216 Circuit Analysis I Lecture # 10 – Chapter 3
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2 Measuring Resistance Wheatstone Bridge used to measure resistance fairly accurately. Bridge configuration consists of 2 fixed and 1 variable resistance along with a battery source and a galvanometer. Variable resistance is adjusted until the bridge is “balanced” – i.e. galvanometer reads zero.
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3 Wheatstone Bridge 1/2 R3 (variable resistance) is adjusted so that no current flows through the meter Voltage across meter terminals is equal. Apply KCL at both terminals: Apply KVL around both loops: R X = (R 2 /R 1 )R 3
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Wheatstone Bridge 2/2 When R 2 /R 1 = 1, R X = R 3 R 3 should vary over a range of resistances which includes the value R X , otherwise the Wheatstone Bridge would never be balanced. To cover a wide range of unknown resistance values, the ratio R 2 /R 1 should also be varied. Commercial bridges have pluggable R 1 and R 2 in decimal values (1, 10, 100, 1000 ). R 3
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This note was uploaded on 01/21/2011 for the course EE 216 taught by Professor Azharruaf during the Spring '10 term at NUCES.

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Lecture10 - Chapter 3 - EE216 C ircuit Analysis I Le cture#...

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