# Difficult : Calculate equivalent resistance of the circuit problem .

1. Jun 25, 2013

1. The problem statement, all variables and given/known data

Calculate the total equivalent resistance between A and D -

( All resistors are 1 ohm )

2. Relevant equations
-

3. The attempt at a solution
The only thing I can see is that the two straight 1 ohm resistors are in parallel , giving 1*1/1+1= 1/2 resistance. But what next , please help !

2. Jun 25, 2013

### Staff: Mentor

It's not clear what you mean by "the two straight 1 ohm resistors", but try this...

Since B and C are open circuits for this question, delete their respective 1 Ohm resistors. Then re-draw the circuit, with A at the top and D at the bottom. See if you can draw the resistors in a more normal configuration, using this simplification...

3. Jun 26, 2013

### CWatters

There are no resistors directly in parallel so the above can't be right.

Do what berkeman said.

4. Jun 26, 2013

Okay.
After deleting those two , I can see two pairs of resistors in series giving 2 each. Then these two 2 ohm resistors are in parallel , giving 1 ohm. Now these is in series with the remaining two 1 ohm resistors giving 3 ohm as the answer. Am I correct ?

5. Jun 26, 2013

### anhnha

I am sure that you are correct.

6. Jun 26, 2013

I agree.