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Wheatstone Bridge Experiment

by uchicago2012
Tags: bridge, experiment, wheatstone
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uchicago2012
#1
Mar15-11, 01:53 PM
P: 75
1. The problem statement, all variables and given/known data
1. Why is the Wheatstone bridge measurement capable of so much greater accuracy than the measurement or resistance with voltmeters and ammeters, using R = V/I?
and
2. R in this experiment is a resistance box and so is accurate to the nearest ohm. Is this uncertainty in R more or less important than the uncertainties in L1 and L2?

2. Relevant equations
Attached doc for procedure

3. The attempt at a solution
I'm not sure about these two questions for my post-lab. For 1, I thought that the Wheatstone bridge would be more accurate because it's independent of the supply voltages, other than from thermal inaccuracies. But I don't know why beyond that- maybe that's all the question is getting at? Not sure.
And for 2, I really don't know. Both are in the equation? So why would one be 'more important' than the other, anyway?

Thanks for any insight
Attached Files
File Type: doc Wheatstone_revised1.doc (62.0 KB, 11 views)
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