BASIC ELECTRICAL ENGINEERING

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Name : P. Shyamsunder Reddy
Designation : HEEES
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 : Low Resistivity Materials
Teaching Aids : PPT, Animation, Diagrams
Revised by : A.K.Srikanth, L/EEE, Q.Q.GPT, HYD

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Recap
In the previous class ,we have discussed about
• Classification of electrical engineering materials
• Application of electrical engineering material
• Heat treatment methods of electrical engineering
materials
• Electrical and mechanical properities of copper
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• Understand the requirements of various
low resistivity materials
On completion of this period , you would be able to
• Understand the applications of various
low resistivity materials
Objectives

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What are the types of conducting materials used for
• House wiring ?
• Electrical machine windings ?
• Power transmission lines ?
• Low resistivity conducting materials like copper, aluminium
and their alloys are used.

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Low Resistivity Materials
• Materials having high conductivity
• Gold, Silver , Copper, Aluminum are having
the low resistivity
• Used where the power loss and voltage drop is
low ( Electrical Machines, House wiring,
Transmission & Distribution of Electrical Power )

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• Low resistivity materials are used in
house wiring as shown in figures
Low Resistivity Materials

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The windings of transformers, motors and generators are
shown in figure
transformer
Motor winding
Copper wire
Low Resistivity Materials

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Power transmission and distribution lines are
shown in figure
Transmission & Distribution Lines
Transmission Lines
Distribution Lines
Low Resistivity Materials

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Requirements of Low Resistivity Materials
• Low temperature coefficient of resistance
• Low voltage drop
• High mechanical strength
• Small power loss

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• Low contact resistance
• Resistant to corrosion
• High malleability
• High ductility
Requirements of Low Resistivity Materials

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• High solderability
• Low cost
• Low specific Resistance
• No brittleness
Requirements of Low Resistivity Materials

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Summary
• Low resistivity materials should have low
resistance, less power loss and low voltage drop.
• Low resistivity materials are used for windings
and wiring etc.

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Quiz
1. Low resistivity materials should have
( a ) Low resistance
( c ) Low power loss
( b ) Low voltage drop
( d ) All of the above

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2. Low resistivity material is
(a) Copper
(c) Tungsten
(b) Platinum
(d) None of the above
Quiz

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Frequently Asked Questions
1. What are the requirements of low
resistivity materials.
2. What are the applications of low resistivity
materials.

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In the next class we will discuss about
Next Class topic
• Understand the properties of Copper
• Understand the applications of Copper in
Electrical Engineering.
• Understand the properties of Aluminium
• Understand the applications of Aluminium in
Electrical Engineering.

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The will to win, the desire to
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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THANK YOU