Agreed Tony, I was just assuming using the wire as 2 arms of the bridge, tapped near the centre, along with an unknown R and a well known (and preferably variable) resistance, like the old 1m & 2m wire bridges.A true Wheatstone bridge has 4 resistors (at least one variable and one "unknown"), a battery and a sensitive meter.
The ratio of two of the resistors can be changed to give x10, x100, x0.1, x0.01 etc and the variable resistor is adjusted untill the bridge balances (ie no current flows through the meter.
Wheatstone bridge - Wikipedia
en.wikipedia.org
What you are describing is a simple meter bridge. used for tapping off various voltages from a power supply.
I've just made one to read 120 Ohm strain gauges. Two arms are 120 Ohm fixed resistors, one is the strain gauge and the other, is two potentiometers. One 10 Ohm [fine] and a 220 Ohm [course].Morning All
Any advice on making homemade Wheatstone bridges? Is it just as simple as a meter ruler, electrical tape and some nichrome wire?
Thanks in advance.