This physics video tutorial explains how to make an electromagnet using a steel nail, copper magnet wire, sandpaper, and AA batteries. It also explains two things that you can do to increase the strength of the magnetic field produced by the electromagnet.
Electromagnetic Induction:
https://www.youtube.com/watch?v=XCPmjj-FMsU
The Crookes Radiometer:
https://www.youtube.com/watch?v=oqSThC47C4k
The Gallon Crusher:
https://www.youtube.com/watch?v=abXVQZlFPJg
Homopolar Motors:
https://www.youtube.com/watch?v=MEdAvKiFe9w
The Siphon:
https://www.youtube.com/watch?v=LcgHlrtacJk
Voltage Booster Circuit:
https://www.youtube.com/watch?v=2-JH80yq--s
How To Convert Heat Into Electricity:
https://www.youtube.com/watch?v=LX2cU27kUUc
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