7b. Superposition

Question 1

What is superposition?

Answer 1

The ability to find the current or voltage flow at a point in a circuit by seperating current or voltage sources and adding each seperate formulas to find the overal current or voltage at each point.

Question 2

How do we do superposition?

Answer 2

1. We start by picking one source and setting the others to zero (voltage sources -> short circuits, current sources -> open circuits).
2. We then work out each equation for voltage or currents around the circuit.
3. Pick another source
4. Continue through all sources then add up the individual calculations to work out the total which is the sum of each voltage or current source.

Question 3

Work out this question!

Answer 3

Answer:
* 1/6 V1 + 5/6 V2

Explaination:
* Setting V2 to zero with a short-circuit, notice that R2 is parallel with the 2k ohm resistor near Vout, so we can use the potential divider formula to find Vin for V1.
* Setting V1 to zero with a short-cicuit, notice that R1 is parallel with the 2k ohm resistor near Vout, so we can use the potential divider formula to find Vin for V2.
* We then add the two individiual voltages together to find the final answer