1. The COIL and the
wonderful properties of
INDUCTANCE

2. A tale of two properties….
 Electricity Makes Magnetism?
 Magnetism Makes Electricity???
 Electricity Makes Magnetism Makes
Electricity?????

3. What is Magnetism?
• The magnet is surrounded by an invisible
force field
• All magnets have a North and South POLE
• Opposite poles attracted each other
• All ferrous (containing iron) materials can be
magnetized
• The earth is the biggest magnet around

4. The iron core of
the earth allows a
magnetic field to
be created

6. Hans Christen Oersted

7. Flux Lines

9. Brain Waves

10. Joseph Henry’s Bigger and
“Badder” Electromagnet

11. Underwear saves the
electromagnet
Henry’s Electromagnet

12. 2000 lbs winner
Testing Henry’s
New Electromagnet

13. Iron Tape
Technology

14. Back to the Present……
1st
5th
3rd
2nd
4th

16. Michael Faraday

17. Radio…Who’s your DADDY?
Electromagnet
Energy
Electro-mechanical

18. Speakers Section

19. How a DC Motor Works

20. Old Henry Makes a Transformer

21. Primary to Secondary Coil

22. Coil Symbol