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Hi there,
There are lots of great electricity resources on the Grade 9 Science guide on the VLC, here:
http://vlc.ucdsb.ca/9science
Here are a couple more resources for diodes:
http://www.technologystudent.com/elec1/diode1.htm
http://www.allaboutcircuits.com/vol_3/chpt_3/1.html
here is a good diagram of a diode:
Taken from: http://www.thefreedictionary.com/diode
Hope this helps!
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