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Ok, so I used to do electronics at school. Yes I utterly failed it, but still, this amuses me. The site it is from amuses me too...

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from www.teachengineering.org

Ohm's Law I - Activity

Electrical circuit diagram showing how to connect three 1.5 volt batteries in…

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Electrical Wiring Diagrams, Stereo Contact And Stereo Jack Wiring Diagram With Circuit Board: Stereo Jack Wiring Diagram