Let us take two resistors R1 and R2 in series and voltage source V (figure below). Resistors are in series here and create a single-loop with…
Category: Circuit Fundamentals
Circuit Fundamentals: Preface
Aim of the study element
To explain basic concepts of circuit theory, and explain techniques needed to analyse simple linear and non-linear circuits.
Learning outcome
Having successfully completed this element you will be able to:
- Understand the building blocks of circuit theory.
- Understand the key concepts in circuits, such as impedance, current, power, voltage.
- Analyse ideal simple analogue circuits.
- Analyse circuits using complex numbers.
- Build and undertake measurements for simple analogue circuits.
- Select and use propper mathematical tools for the solution of problems in circuits.
Current division – equivalent resistance for parallel connection
Let us take n resistors R1 ... Rn connected in parallel with voltage source V. According to Ohm’s Law the same voltage goes through each resistor.…
Wye-Delta and Delta-Wye conversion
Usually electric circuit schemes appear complex where it’s not easy to find out parallel or serial connection for elements. Here below we will consider…
What is mesh and node analysis
This post answers the question "What is mesh and node analysis". This two techniques are both used as basic analysis methods for circuits. When…
Volt-ampere characteristics of a circuit part with source
Ohm’s Law can be applied to a piece of a circuit with a source, and we can draw a Volt-Ampere characteristic for this piece…
Kirchhoff’s Law application for circuits analysis
Basic laws of electric circuit theory are Kirchhoff's Laws – the law of the currents balanced in the circuit nodes (first Kirchhof's Law) and…
Kirchhoff’s Law – mesh method
The idea of this mesh method is calculating mesh currents of meshes (closed loops in a circuit), instead of the currents of branches, using…
Kirchhoff’s Law – nodal method
The idea of this nodal method is to find voltages of the nodes using the first Law of Kirchhoff, concerning the reference (ground) node.…
Superposition principle
In the linear circuit with voltage sources, mesh currents are linear functions of mesh EMFs. Ii=1∆R∑k=1nVk∆ki The current in any mesh, containing more then…
General nodal analysis
It is possible to generalise the Nodal analysis method to use it for all electric circuits. This means the nodal method should work with…