- #1
Ali Zain
- 2
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Homework Statement
There is a figure, I'll try my best to draw/describe.
1. All three resisters are in parallel
___R____
!___R____!
!___R____ !
2. 2 resisters are parallel and one in series, after the parallel (ignore the dots)
___R___
... _____R___
!___R___ !
3. 2 resisters are in series and one in parallel.
____R____R____
______R_______!
Homework Equations
For resistors in parallel: 1/R(eq)= 1/R1+ 1/R2+1/R3...
For resistors in series: R1+R2+R3...
The Attempt at a Solution
Ok!
So, for the first one the resistance (eq)= 1/R+1/R+1/R= 1/3R
for 2. I first added R in parallel= 1/2R and with added R separately, that gave me, 1.5R
for 3. I first added two resistors in series R+R= 2R, then I added this 2R using parallel resistance equation. 1/2R + 1/1R = 1.5 R.
I know for a fact this is wrong, resistance of #3 should be less than that of #2. Since it is in parallel.
Can someone please explain what I'm doing wrong here?
Thank you
Ali