Lecture 5

Question 1

What is the superposition thereom in electrical circuits?

Answer 1

The response in any branch of linear circuit with multiple power sources equals the algebraic sum of the responses caused by each source acting alone.

Question 1

How do you deactivate voltage and current sources in superposition?

Answer 1

Deactivated voltage source (equivalent to a short circuit) - voltage = 0
Deactivated current source (equivalent to a open circuit) - current = 0

Question 2

What are the steps to apply the superposition principle?

Answer 2

1. Identify power sources
2. Consider each source separately, deactivating others
3. Find unknown parameters for each source
4. Repeat for all sources
5. Calculate algebraic sum of results

Question 3

What is Thevenin’s equivalent circuit?

Answer 3

Any collection of power sources and resistances connected between two terminals is electrically equivalent to a voltage source (Vₜₕ) and a single resistance (Rₜₕ) in series.

Question 4

How do you determine Thevenin’s equivalent voltage?

Answer 4

Vₜₕ is equal to the open circuit voltage between the two terminals.

Question 5

How do you calculate Thevenin’s equivalent resistance?

Answer 5

Rₜₕ is equal to the equivalent resistance of the network between the two terminals with all power sources deactivated.

Question 6

Why is circuit modelling important?

Answer 6

It simplifies complex circuits, making it easier to analyse and understand their behaviour under varying conditions (power supply levels, loads).

Question 7

What is the key principle in nodal analysis?

Answer 7

Apply KCL at nodes to create equations for solving unknown voltages.