BASIC ELECTRICAL ENGINEERING

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Name : B. Damodaram
Designation : Lecturer
Branch : Electrical & Electronics Engineering
Institute : Govt. polytechnic, Mahabubnagar
Year/Semester : I Year
Subject : Basic Electrical Engineering
Subject Code : EE105
Topic : Conducting Materials
Duration : 50 minutes
Sub Topic : Comparison of Copper and Aluminium
Teaching Aids : PPT, Animation, Diagrams
Revised by : A.K.Srikanth, L/EEE, Q.Q.GPT, HYD

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• Understand the properties of Copper
• Understand the applications of Copper in
Electrical Engineering.
In previous class we have discussed about
Recap
• Understand the properties of Aluminium
• Understand the applications of Aluminium in
Electrical Engineering.

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• Compare Copper and Aluminium in various
Electrical aspects
On completion of this period , you would be
able to
• Understand the Advantages of Copper
over Aluminium
• Understand the Disadvantages of Copper
over Aluminium
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Objectives

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What are the types of conducting materials
used for the following purposes ?
Over head conductors Cables
Copper conductor
Aluminium conductor
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Which conducting material is suitable for the
windings of Motors and Transformers ?
Copper conductor
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Comparison of
Copper and Aluminium
COPPER ALUMINIUM
• It is costly • It is cheap
• 100% conductivity • 75% conductivity
• Heavier • Lighter
• Silver white in
colour
• Reddish-brown
in colour
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• High Tensile
strength
• Low Tensile strength
• Can withstand rough
handling
• Can be soldered and
welded easily
• Ductile and
malleable
• Can not withstand
rough handling
• Cannot be soldered
and welded easily
• Ductile and
malleable
COPPER ALUMINIUM
Comparison of
Copper and Aluminium Contd..

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• Good resistance to
corrosion
• Small cross-section
can carry heavy
current
• Less suitable for
cold climate
• 50% more to
carry the same
current
• Good resistance to
corrosion
• More suitable for
cold climate
• Not brittle in nature • Brittle in nature
COPPER ALUMINIUM
Comparison of
Copper and Aluminium Contd..

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• Can easily be
twisted repeatedly
• Due to brittleness,
can not be twisted
• Low contact resistance • High contact resistance
• Melting point is 1084 0C • Melting point is 658 0C
• Boiling point is 2927 0C • Boiling point is 1084 0C
COPPER ALUMINIUM
Comparison of
Copper and Aluminium Contd..

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• Used in windings of
electrical machines
• Can not be used in
windings of electrical
machines
• Due to smaller cross-
section, effect of snow
and wind pressure is
less
• Due to larger cross-
section effect of snow
and wind pressure is
more
COPPER ALUMINIUM
Comparison of
Copper and Aluminium Contd..

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• The conductivity of Aluminium is next to Copper.
• Both forms important alloys with many metals
• Both Copper and Aluminium are the best
Conductors of electricity
• Aluminium can’t be twisted easily than Copper
due to its brittleness
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Summary
In this period we have discussed about

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1. Contact resistance of Aluminium is
a) More than copper
b) Less than copper
c) Equal to copper
d) None of the above
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Quiz

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2. Which material is suitable for cold climate
a) Copper
b) Aluminium
d) none of the above
c) Both (a) & (b)
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Quiz

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1.Compare Copper and Aluminium in various aspects
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2. What are the advantages of Copper over Aluminium
3. What are the advantages of Aluminium over Copper
Frequently Asked Questions

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succeed, the urge to reach your
full potential... these are the
keys that will unlock the door to
personal excellence.
Eddie Robinson

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