
Unit 5: 
Electrical and Electronic Principles 


Unit code:

R/601/1453



QCF level:

5



Credit value:

15






• Aim
This unit provides an understanding of electrical and electronic
principles used in a range of engineering careers and provides the basis for
further study of more specialist areas of electrical/electronic engineering.
• Unit abstract
Circuits and their characteristics are fundamental to any study of
electrical and electronic engineering and therefore a good understanding is
important to any engineer.
The engineer must be able to take complex electrical circuit problems,
break them down into acceptable elements and apply techniques to solve or
analyse the characteristics. Additionally, fine tuning of the circuits can be
performed to obtain required output dynamics.
This unit
draws together a logical appreciation of the topic and offers a structured
approach to the development of the broad learning required at this level.
Learners will begin by investigating circuit theory and the related theorems to
develop solutions to electrical networks.
In learning outcome 2 the concept of an attenuator is introduced by
considering a symmetrical twoport network and its characteristics. The design
and testing of both T and Ï€ networks is also covered.
Learning outcome 3 considers the properties of complex waveforms and
Fourier analysis is used to evaluate the Fourier coefficients of a complex
periodic waveform.
Finally, learning outcome 4 introduces the use of Laplace transforms as
a means of solving first order differential equations used to model RL and RC
networks, together with the evaluation of circuit responses to a step input in
practical situations.
• Learning outcomes
On successful completion of this unit a
learner will:
1 Be able to apply electrical and electronic circuit theory 2 Be able to
apply twoport network models
3 Understand the use of complex waves
4 Be able to apply transients in RLC
circuits.
Unit content
1 Be able to apply electrical and electronic
circuit theory
Transformation theorems: energy sources as constantvoltage and constantcurrent generators;
ThÃ©venin’s and Norton’s theorems; deltastar and stardelta transformation
Circuit
theory: maximum power transfer
conditions for resistive and complex circuits; mesh and nodal analysis;
the principle of superposition
Magnetically
coupled circuits: mutual
inductance; the use of dot notation; equivalent circuits for
transformers including the effects of resistive and reactive features
RLC tuned
circuits: series and parallel
resonant circuits; impedance; phase angle; dynamic resistance; Qfactor;
bandwidth; selectivity and resonant frequency; the effects of loading on tuned
circuit performance
2 Be able to apply twoport network models
Network
models: symmetrical twoport
network model; characteristic impedance, Z_{o}; propagation
coefficient (expressed in terms of attenuation, Î±, and phase change ÃŸ); input
impedance for various load conditions including Z_{L} = Z_{o;} relationship between the neper and the dB;
insertion loss
Symmetrical attenuators: T and Ï€ attenuators; the expressions for
R_{o} and Î± in
terms of component values
3 Understand the use of complex waves
Properties: power factor; rms value of complex periodic
waveforms
Analyse: Fourier coefficients of a complex periodic
voltage waveform eg Fourier series for rectangular, triangular or
halfwave rectified waveform, use of a tabular method for determining the
Fourier series for a complex periodic waveform; use of a waveform analyser; use
of an appropriate software package
4 Be able to apply transients in RLC circuits
Laplace
transforms: definition of the
Laplace transform of a function; use of a table of Laplace transforms
Transient analysis: expressions for component and circuit impedance in the splane; first
order systems must be solved by Laplace (ie RL and RC networks); second
order systems could be solved by Laplace or computerbased packages
Circuit responses: over, under, zero and critically damped response following a step
input; zero initial conditions being assumed
Learning outcomes and assessment criteria
Learning outcomes

Assessment criteria for pass



On successful completion of

The learner can:



this unit a learner will:








LO1 Be able to apply electrical and

1.1

calculate the parameters of AC equivalent
circuits


electronic
circuit theory


using transformation theorems



1.2

apply circuit theory techniques to the
solution of AC




circuit problems



1.3

analyse the operation of magnetically
coupled




circuits



1.4

use circuit theory to solve problems
relating to series




and parallel RLC tuned circuits






LO2 Be able to apply twoport

2.1

apply twoport network model to the
solution of


network
models


practical problems



2.2

design and test symmetrical attenuators
against




computer models






LO3 Understand the use of

3.1

calculate the properties of complex
periodic waves


complex
waves

3.2

analyse complex periodic waves









LO4 Be able to apply transients in

4.1

use Laplace transforms for the transient
analysis of


RLC
circuits


networks



4.2

calculate circuit responses to a step input
in practical




situations.






Guidance
Links
This unit relies heavily on the use of
mathematical analysis to support the underlying theory and practical work.
Consequently it is assumed that Unit 1: Analytical Methods for Engineers
has been taught previously or is being delivered in parallel. It may also be
linked with Unit 2: Engineering Science.
Essential requirements
Learners
will require access to a range of electronic test equipment, eg oscilloscopes,
signal generators, etc.
Employer engagement and vocational contexts
Delivery of
this unit will benefit from centres establishing strong links with employers
willing to contribute to the delivery of teaching, workbased placements and/or
detailed case study materials.
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