1. 電磁學歷史的報告AVI檔
通訊一甲 B
李忠憲

2. Early Investigations of Electricity and Magnetism
B.C Thelas (Greek)
Math. Astr. & Phil.
Amber = elektron (Greek)
Electricity, electron, electronic
Loadstone, found in Magnesia
=> Magnet, Magnetism
Fluff
Amber
Silk
L. S.
L. S.

3. A. D. 1600 William Gilbert (English)
Systematic experiments of electrostatic effects
Recognized that the earth is a huge magnet
Principles of compass S N
Earth

4. 1752 Benjamin Franklin (American)
Established conservation of charge
Positive (glass) and Negative (hard rubber) charges were named.
Kite experiment
Suggested the use of
lightning rods
to protect buildings

5. 1785 Charles Augustin de Coulomb (French)
Measured electric and magnetic forces
Coulomb’s Law

6. 1800 Alessandro Volta (Italian)
Invented voltaic cell (Chemical Battery)
Constant
Current
Zinc
Copper

7. 1819 Hans Christian Oersted (Danish)
Discovered Electricity can produce Magnetism
E & M are related

8. 1820 Andre Marie Ampere (French)
Motor equation

9. Three-pole DC Motor

10. 1826 Georg Simon Ohm (German)
Formulated Ohm’s law
1839 Contributions were recognized
1843 Verified by Wheatstone
(Wheatstone bridge)

11. 1831 Michael Faraday (English)
Demonstrated that magnetism could produce electricity
Faraday’s law
Faraday’s experiment