# Circuit Theory/Superposition

## Contents

## Goal[edit]

Split multisource circuit into smaller, simpler circuits, compute current or voltage and add.

## Procedure[edit]

Pick one source, turn off all or set to zero all others:

- Set Voltage Sources to V=0, doesn't care about current so is a short
- Set Current Sources to I=0, doesn't care about the voltage so turns into an open

## Example 1[edit]

Find the current through the 3 ohm resistor assuming moving left to right is positive:

The total current in the direction shown on the original diagram is going to be:

## Example 2[edit]

Find the current through the 4 ohm resistor assuming moving left to right is positive:

Simulation at circuit lab confirms the answer: