# How to calculate effective resistance?

## Homework Statement

There are two images:-
Resistance- Calculate effective resistance between X and Y
Resistance1- Calculate effective resistance between A and D

## The Attempt at a Solution

Resistance- I dont think any current passes through the 20 ohm resistor so it seems 10 ohm to me. what do you say?

Resistance1- is it right??
10+10+(1/(2/20))
=30 ohm???

#### Attachments

• Resistance.JPG
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• Resistance1.JPG
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I don't think you can solve these with ordinary resistance reduction, at least it is too complicated for me to try. I used ohm's law, kirchoff's voltage law and constraints. You know that the if you take any loop that the total voltage is zero, and when all the voltage loops are accounted for you can use linear algebra to solve for the system.

I don't think you can solve these with ordinary resistance reduction, at least it is too complicated for me to try. I used ohm's law, kirchoff's voltage law and constraints. You know that the if you take any loop that the total voltage is zero, and when all the voltage loops are accounted for you can use linear algebra to solve for the system.

I will be glad if you explain to me what you want to convey...

Its simply a wheatstone bridge redrawn ...

1.apply superposition theroem
2.u will egt current and potential difference across the (upper and lower) ,and the (first and last) resistor are the same .
3 $$10 \Omega$$