Electric circuits and electromagnetic field theory are essential for any electrical engineering field. Many branches such as power machines, electronics, communications and all modern…

# 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.

## Charge / electrical current

The concept of charge is a basic one to explain the phenomena of electricity. The quantity of electricity is an electrical charge. Electric charge…

## Voltage / power

To move an electrical charge in a specific direction you need to apply some force. This force is called by an external electromotive force…

## Electric circuits elements / active elements

A circuit is an interconnection of circuit elements. And analysing circuits we determine voltages and currents through the circuit elements. Let's assume that all…

## Passive elements – resistance

Resistance is an ideal electric circuit component, which is characterised by energy losses in a circuit as heat, some mechanical work, or electromagnetic radiation.…

## Passive elements – inductance

Inductance is an ideal electric circuit component which is close to the inductor in its features and components - collecting the energy of magnetic…

## Passive elements – capacitance

Capacitance is an ideal element of an electric circuit, replacing the capacitor, storing the energy of electric field. Capacitance is marked with the letter…

## Replacing circuit components with ideal circuit elements

Let us talk about the importance of replacing real circuit components by their ideal circuit elements, taking into account complex factors. Representation of resistance,…

## Linear electric circuits

Linear electric circuits and linear circuit elements are those where resistance, capacitance and inductance are not dependent on the current or voltage magnitude and…

## Voltage and current division – equivalent resistance for series connection

Let us take two resistors R1 and R2 in series and voltage source V (Figure 8). Resistors are in series here and create a…