qdung92ct - 28-3-2012 at 05:40
Hi
I do experiment to measure electrical conductivity of solution by Wheatstone Bridge
In the textbook, It shows the experiment must use the alternative current
Why does it use the alternative current, not direct current ?
Thanks
malcolmf - 28-3-2012 at 09:02
Just a guess: to minimize electrode polarization?
neptunium - 28-3-2012 at 10:39
i used this freeware (yes its free) that works with the soundcard of any pC.
you have to make your own electrodes and and wiring but if it was using DC you`ll be mad too!
http://www.noise.physx.u-szeged.hu/edudev/Thermometer/
oh yeah it does thermometer too..
[Edited on 28-3-2012 by neptunium]
bfesser - 28-3-2012 at 17:08
Because <a href="http://en.wikipedia.org/wiki/Direct_current" target="_blank">direct current</a> <img src="../scipics/_wiki.png" />
will cause <a href="http://en.wikipedia.org/wiki/Electrolysis" target="_blank">electrolysis</a> <img src="../scipics/_wiki.png" />
to occur, which will quickly change the <a href="http://en.wikipedia.org/wiki/Conductivity_(electrolytic)" target="_blank">electrolytic
conductivity</a> <img src="../scipics/_wiki.png" /> (and other properties) of the solution under test.
<strong>qdung92ct</strong>, to what textbook are you referring?
[Edited on 7/9/13 by bfesser]
qdung92ct - 28-3-2012 at 22:01
I see in my report, which has question after doing experiment.
why do the system measuring electrolytic conductivity by wheatstone bridge use the alternative current, not direct current ?
The machine - the system measuring electrolytic conductivity by wheatstone bridge use the probe for tracking electrolytic conductivity. actually I
dont know how it operates 