Here's a list of most of the materials you need for this unit, plus links to buy them online.
Below are some electricity and magnetism resources that didn't fit anywhere else. You can also look at my Electricity Unit Pinterest Board.
I really had to do a lot of reading before I FINALLY got it straight in my mind what the difference between volts, amps, ohms, and watts is. Here are some resources for that:
http://science.howstuffworks.com/environmental/energy/question501.htm
http://www.candlepowerforums.com/vb/showthread.php?9200-Amps-vs-Watts-vs-Volts
http://www.ducksters.com/science/electricity_102.php---some good electricity basics
http://www.physics4kids.com/files/elec_current.html
Robert Krampf's electricity show is really fun (subscription required---it's worth it! We love Robert Krampf and use his site all the time)
We loved this interactive animation for helping us understand AC and DC.
And here's a video that talks about the differences between AC and DC, and the contributions of Edison and Tesla to each.
LOVE this video explaining transistors and semiconductors. So clear!
Building a telegraph looks fun---we did something similar with the snap circuits. This could go with a lesson on the transcontinental railroad, too.
We spent a day talking about electricity in animals (we had some good books on the subject) and this article was interesting too.
And here's a short video about electric eels
Seb's illustration of the electromagnetic spectrum
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