Thank you for your reply but could you explain what you mean by the same node? I know that there is no current flow across them so they are at the same voltage. But does that mean that when the two currents come together at node c, they both must have had the same voltage drop?
Thank you Naty1 and dexterbala...
I read the wikipedia explanation for Wheastone bridge, but I still don't understand this part...
It says on wikipedia that (http://en.wikipedia.org/wiki/Wheatstone_bridge)
"Kirchhoff's second rule is used for finding the voltage in the loops ABD and BCD...
So this is the question...
In the direct circuit diagram below (please see the attached file), Resistors 1 and 3 have fixed resistances (R1 and R3, respectively), which are known. Resistor 2 is a variable (or adjustable) resistor, and the resistance of Resistor 4 is unknown.
Show that if...