HI...

i'm not being able to understand where does this formula come from:

legend
Vo= OUTPUT or revelation voltage of the bridge
E = supply voltage
x= unknow resistance
a, b, c = left resistors (a next to b ; c next to x )......

...it should come from the voltage divider but cannot see how...


Vo= (Ex/x+c)-(Ea/a+b) = [(x/x+c)-(a/a+b)]E

..hope someone is gonna help me

please

 

Greetings Ivano,

We request that you always start your own thread rather than tack your request for assistance onto an existing thread.

For this reason, I have moved your request to its own thread so that it will receive the attention it deserves.

hgmjr

 

Ivano,

Vo= (Ex/x+c)-(Ea/a+b) is based on the voltage divider rule. Ex/(x+c) is using the rule to find Vx, and Ea/(a+b) is finding Va.

Here is a good short step-by-step explanation on basic Wheatstone bridge math.
http://www.efunda.com/designstandards/sensors/methods/wheatstone_bridge.cfm

 

Thank you both

..you're right hgmjr , i'm sorry..iìll try to pay more attenction next

silvrstring..i saw it was actually easy,..but i panic sometimes and i seem to fall in a black hole..

THANK you guys Ivano