Understanding the (point of) the Wheatstone Bridge
- From: Jamie Jackson <mySpamB8@xxxxxxxxx>
- Date: Fri, 21 Sep 2007 02:18:05 -0000
My son and I are working through some circuits from a Forrest M.
Mims / Radio Shack learning lab. We got to a Wheatstone Bridge
circuit, but I'm trying to understand the usefulness of it.
Let's use this diagram, for reference: http://en.wikipedia.org/wiki/Wheatstone_bridge
If you need to adjust R2 in order to get the value of Rx, how do you
even know what R2 is anymore (since you've adjusted it)? Is R2 some
fancy high-accuracy *graduated* variable resistor that I've never
heard of?
After seeing the diagram, I'm thinking: Well, if I have to measure my
R2 with my multimeter, I might as well measure Rx while I'm at it,
which blows the point.
Is the point just that they're perfectly balanced, and the point is
not what the actual values are?
Thanks,
Jamie
.
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