Quote:
Originally Posted by Qfwfq
Even with a total absence of friction, the generated current causes its own magnetic field which opposes the motion.
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That is correct. When I was a kid, a friend of mine and I had an antique crank generator from an old phone. Originally, when connected inside of a phone box, it would ring all lines in the circuit(what was known as a "party line"). People would know who the call was for by a code of rings. For example, 2 longs and a short ring or long, long, short--all codes(instead of phone numbers) for the party with whom you wished to speak. Anyway, the harder you cranked the generator, the more resistance you could feel through the crank and the more 'juice' that flowed through the wires. It probably produced an alternating current. One day, while playing with the generator, we saw a fellow several blocks up the street who was washing his car, barefoot. We put the wires in the soapy water trail that was flowing past us and cranked furiously. Man, you should have seen him jump!! He never knew what hit him!
