I know an excellent page that talk about ohm's law and many visual exemple about basic electric law. It's based for car audio but the general content is very helpfull. You will find many applet /java where you only have to enter your value to get the answer
You should visit these page.. you should learn or better unserstand many thing!
Main page:
Basic Car audio Electrinic
http://www.bcae1.com/
--You can also click on the subject you need in the right side of the page----
Fuses:
http://www.bcae1.com/fuses.htm
Ohm's law:
http://www.bcae1.com/ohmslaw.htm
Wire size and loose calculation:
http://www.bcae1.com/wire.htm
Resistor serie/parallel:
http://www.bcae1.com/srsparll.htm
Switch:
http://www.bcae1.com/switches.htm
Relay:
http://www.bcae1.com/relays.htm
Diodes:
http://www.bcae1.com/diodes.htm
Voltage:
http://www.bcae1.com/voltage.htm
Volts:
http://www.bcae1.com/volt.htm
Current:
http://www.bcae1.com/current.htm
Ampere
http://www.bcae1.com/amp.htm
And alot more interesting stuff!
Doc
