Wheatstone Bridge Experiment

by uchicago2012
Tags: bridge, experiment, wheatstone
uchicago2012 is offline
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?
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)
Phys.Org News Partner Science news on Phys.org
SensaBubble: It's a bubble, but not as we know it (w/ video)
The hemihelix: Scientists discover a new shape using rubber bands (w/ video)
Microbes provide insights into evolution of human language

Register to reply

Related Discussions
Wheatstone bridge help Engineering, Comp Sci, & Technology Homework 5
What exactly is a wheatstone bridge? What are its uses? General Physics 3
wheatstone bridge Engineering, Comp Sci, & Technology Homework 6
Wheatstone Bridge Introductory Physics Homework 7