I hate to be a nay-sayer but actually I don't think the alternator/generator and several other things mentioned are technically 'electronic inventions', they are more 'electric inventions'.
The word electronics, although it is used more and more to describe all electric devices, really infers the use of themionic or semiconductor devices to control the flow of electrons. So if it doesnt have a diode, transistor or vaccum tube in it, I don't know that it could be called electronic :P
oh and I vote for the PN junction, the foundation of all modern electronics!
If you want a bit higher level than that, I vote for the switching power supply, whos high effenciency seriosuly improves the battery life of portable electronics.
as far as consumer level devices I would have to say the PC and the internet, making porn so easily available!
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Whoever appeals to the law against his fellow man is either a fool or a coward.
Whoever cannot take care of himself without that law is both.
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Such is the Rule of Honor.
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