Hot Air Generators
Hot Air Generators or Stirling Engine Generator are usually powered by a tea light candle. This hot air engine in the video below is called a Lamina/Laminar Flow Stirling Engine. The engine is connected to a small generator by means of a belt. As a result electricity can be created. This electricity can be used to power many small household devices including radios, LEDs and many other things that ill work off 12 volts. As you can see from the video below, this engine is machined to perfection -
Fully Transparent Hot Air Generator
3B Scientific's Hot Air generator
This Thames & Kosmos Stirling Engine Generator works by focusing the solar energy by using a parabolic dish. This generator also has a voltmeter on the side of the engine, which allows you to check how much electricity you are creating. This YouTube video is an old one, for the last while you have also received a free RC Car with this engine, the generator powers it up, super cool 
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