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…