- #1

zr95

- 25

- 1

## Homework Statement

I'm studying for a test and since this is technically a textbook problem I figured I'd post here to prevent being flagged.

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I have the circuit redrawn.

## Homework Equations

Series: Req = R1+R2...

Parallel: 1/Req= 1/R1 + 1/R2...

## The Attempt at a Solution

I want to understand why when solving this circuit for Req it is (3 || 30) || 7.5 = 2ohms.

According to the solution I'm looking at the 75 ohm resistor is considered a short and no current flows across this? I don't understand why this is the case.

Also I was originally trying to be lazy and solve and just add things up without redrawing the circuit and ended up with 2ohms by doing:

((5||20)+2)||3 = 2ohms

Was this just coincidence?