Download Free A Textbook Of Electrical Technology Volume 1 Pdf
Introduction: A Textbook Of Electrical Technology Pdf
Download Free A Textbook Of Electrical Technology Pdf Volume 1, Suppose that in a conductor, the number of free electrons available per m3 of the conductor material is n and let their axial drift velocity be ν meters/second. In time dt, distance traveled would be ν × dt. If A is an area of the crosssection of the conductor, then the volume is νAdt and the number of electrons contained in this volume is νA dt. Obviously, all these electrons will cross the conductor crosssection in time dt. If e is the charge of each electron, then total charge which crosses the section in time dt is dq = nAeν dt. Since current is the rate of flow of charge, it is given as i = dq nAe dt
dt dt
ν = ∴ i = nAeν
Current density, J = i/A = ne ν ampere/metre2
Assuming a normal current density J = 1.55 × 106
A/m2
n = 1029 for a copper conductor
and e = 1.6 × 10−19 coulomb, we get
1.55 × 106 = 1029 × 1.6 × 10−19 × ν ∴ν = 9.7 × 10−5
m/s = 0.58 cm/min
It is seen that contrary to the common but mistaken view, the electron drift velocity is rather very slow and is independent of the current flowing and the area of the conductor.
Download Free A Textbook Of Electrical Technology Volume 1 Pdf Chapters
Table Of Contents For A Textbook Of Electrical Technology Pdf
1. Electric Current and Ohm’s Law
2. DC Network Theorems
3. Work, Power, and Energy
4. Electrostatics
5. Capacitance
6. Magnetism and Electromagnetism
7. Electromagnetic Induction
8. Magnetic Hysteresis
9. Electrochemical Power Sources
10. Electrical Instruments and Measurements
11. A.C. Fundamentals
12. Complex Numbers
13. Series A.C. Circuits
14. Parallel A.C. Circuits
15. A.C. Network Analysis
16. A.C. Bridges
17. A.C. Filter Networks
18. Circle Diagrams
19. Polyphase Circuits
20. Harmonics
21. Fourier Series
22. Transients
23. Symmetrical Components
24. Introduction to Electrical Energy Generation
Indian Scenario
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