Youtube is full of people that are all about free energy etc... I saw a video about a ball bearing motor (you have a shaft on two bearings, apply DC or AC across the bearings, and the localized heating where the bearing contacts the race causes expansion and the motor to spin, but its not self starting) A simple physics demonstration, that Ive seen in the past. But there are people insisting that:
A) its an induction motor (never mind the fact current is running though the rotor, and there is no windings...)
B) its a homopolar motor (better guess than induction but still wayyy too much friction for that)
c) people who say its a scam (fair enough, enough crap on youtube to be doubtful first)
And last, but certainly not least:
D) The BEDINI MOTOR OVERUNITY, YOU CAN USE THIS WITH PULSER CIRKIT TO GET 4-10V OF POWER AND TO CHARGE AND SUSTAIN ITS OWN POWER SUPPLY.
Gah, I see all sorts of stuff that makes me ask 'why!' People winding all sorts of elaborate motors and windings, and magnets, and so much effort put into it just to fart around, where if they put that much effort into learning the underlying physics, then they wouldnt even need to mess with this and could do something productive with their time. I know 4hv has to actively chase off the overunity crowd. Though I'm sure they find the simple winding of a tesla coil secondary passe and boring by now :p
My workshop aircon unit uses 1.6kW of electricity to produce 5.5kW of heat. Stick a load of efficient thermocouples in series between the hot and cold bits of the heat pump and BAM! Free electricity. Easy.
Kickstarter anyone?
Its fun to use careful wording to get the ire of physics teachers/etc in school. "5.5 KW out, 1.6 KW in, thats 344 percent efficiency!"
You can tell that in their heads they are thinking 'YOU CANT BE OVER 100% EFFICIENT EVER, GAH! '
So they use the term "Coefficient of performance" for heat pumps, so above heatpump would have a CoP of 3.44, and it doesnt tweak the over 100% efficiency nerve