9EE105.44. BASIC ELECTRICAL ENGINEERING POLYTECHNIC

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BASIC ELECTRICAL ENGINEERING

9EE105.44 1
1
Name : G. Snehalatha
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 : Carbon
Teaching Aids : PPT, Animation, Diagrams
Revised by : A.K.Srikanth, L/EEE, Q.Q.GPT, HYD

9EE105.44 2
• Properties of Mercury
• Applications of Mercury
2
Recap
In the previous class we have studied about

9EE105.44 3
• Understand the Properties of Carbon
• Understand the Applications of Carbon
On completion of this period , you would be
able to
3
Objectives

9EE105.44 4
What type of material used for the following
applications ?
• Carbon ( High resistivity conducting material )
4

9EE105.44 5
Carbon
• It is mostly available in the form of Graphite
• Contains about 90% of carbon
• Mostly used as brush for Electric motors
5

9EE105.44 6
1. Carbon is found in the form of coal, coke,
charcoal etc
Properties of Carbon
3. Has negative temperature coefficient of resistance
2. Has very high resistivity of 4600 µΩ-cm
6
4. Melting point is 39000 C
5. Has low surface friction

9EE105.44 7
6. Not affected by moisture, acids and bases
7
7. Has good thermal conductivity
9. Has very good abrasive resistance
8. Gets oxidized in air beyond 3000 C
Properties of Carbon

9EE105.44 8
Applications of Carbon
• Used as brushes in electrical machines
8

9EE105.44 9
• Used as electrodes in cells
9
CARBON ELECTRODES
Applications of Carbon

9EE105.44 10
• It is used as brushes in electrical machines,
Electrodes in cells etc.,
• Has very good abrasive resistance
• Carbon is found in the form of coal, coke,
charcoal etc.,
10
Summary
In this period we have discussed about

9EE105.44 11
1. Carbon has
a) High surface friction
b) Low surface friction
c) No surface friction
d) None of the above
11
Quiz

9EE105.44 12
a) Positive temperature coefficient of resistance
c) Both (a) & (b)
d) None of the above
2. Carbon has
b) Negative temperature coefficient of resistance
12
Quiz

9EE105.44 13
1. State the properties of Carbon
2. State the applications of Carbon
13
Frequently Asked Questions

9EE105.44 14
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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9EE105.44. BASIC ELECTRICAL ENGINEERING POLYTECHNIC

1. 9EE105.44 1 1 Name : G. Snehalatha 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 : Carbon Teaching Aids : PPT, Animation, Diagrams Revised by : A.K.Srikanth, L/EEE, Q.Q.GPT, HYD

2. 9EE105.44 2 • Properties of Mercury • Applications of Mercury 2 Recap In the previous class we have studied about

3. 9EE105.44 3 • Understand the Properties of Carbon • Understand the Applications of Carbon On completion of this period , you would be able to 3 Objectives

4. 9EE105.44 4 What type of material used for the following applications ? • Carbon ( High resistivity conducting material ) 4

5. 9EE105.44 5 Carbon • It is mostly available in the form of Graphite • Contains about 90% of carbon • Mostly used as brush for Electric motors 5

6. 9EE105.44 6 1. Carbon is found in the form of coal, coke, charcoal etc Properties of Carbon 3. Has negative temperature coefficient of resistance 2. Has very high resistivity of 4600 µΩ-cm 6 4. Melting point is 39000 C 5. Has low surface friction

7. 9EE105.44 7 6. Not affected by moisture, acids and bases 7 7. Has good thermal conductivity 9. Has very good abrasive resistance 8. Gets oxidized in air beyond 3000 C Properties of Carbon

8. 9EE105.44 8 Applications of Carbon • Used as brushes in electrical machines 8

9. 9EE105.44 9 • Used as electrodes in cells 9 CARBON ELECTRODES Applications of Carbon

10. 9EE105.44 10 • It is used as brushes in electrical machines, Electrodes in cells etc., • Has very good abrasive resistance • Carbon is found in the form of coal, coke, charcoal etc., 10 Summary In this period we have discussed about

11. 9EE105.44 11 1. Carbon has a) High surface friction b) Low surface friction c) No surface friction d) None of the above 11 Quiz

12. 9EE105.44 12 a) Positive temperature coefficient of resistance c) Both (a) & (b) d) None of the above 2. Carbon has b) Negative temperature coefficient of resistance 12 Quiz

13. 9EE105.44 13 1. State the properties of Carbon 2. State the applications of Carbon 13 Frequently Asked Questions

14. 9EE105.44 14 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