Hi, everyone. I am new to the electronics and circuit schematics, although i do have a physics background from high school (ie Ohms law and Kirchoffs laws). However, the circuit schematics sometimes throw me off completely. For example, this circuit i made in EveryCircuit app. Can someone please explain to me, why does the current doesn't flow through 2 bottom resistors in the middle? I just can not wrap my head around it. Can someone please explain it to me or at least suggest any educational material that covers it? I know it is may sound as basic, simple question, but for me its a struggle.

 

why does the current doesn't flow through 2 bottom resistors in the middle?

hi Marc,
Welcome to AAC,
According to your simulation it shows current flowing thru those resistors.???
E

 

hi Marc,
A LTSpice sim confirms your sim, ie: no current flow in those resistors.
E

 

Yes, correct!

 

Yes. But my question is why it does not flow through this two resistors? I can not understand theory behind it

 

Hi Marc,

Your circuit can be redrawn and it is a wheatstone bridge. Since the bridge is balanced there wont't any current flowing through these resistors.
https://www.electronics-tutorials.ws/blog/wheatstone-bridge.html

 

hi Marc,
Its a balanced Bridge circuit.
Redrawn to show the bridge.
E

 

Yes. But my question is why it does not flow through this two resistors? I can not understand theory behind it

Because theres no ground (-) path for them to flow, notice at the mid point, all currents divert toward the other 2 resistors because theres a - path for them to flow, on this side, at the junction of the 2 4.7k, voltage is already at 500mv, so they are kinda got stuck!

 

Thank you, guys! You helped me a lot!