One of the easiest way to make electricity with a pc fan is with four neodymium magnets. In this instructable i will show you how to make a generator with a pc fan and four neodymium magnets.
CAUTION: NEODYMIUM MAGNETS ARE VERY POWERFUL.
Items you will need:
* A PC Fan
* 4 Neodymium magnets
* Multimeter (to test)
* Bulb(try one that uses less current)
Stick a magnet at the left corner of one of the four sides with tape. Then stick another magnet with the same pole facing the surface of the other side's left corner and stick with tape. Repeat the same process for the rest of the two sides, as shown in the picture above. The fan should start spinning, if it doesn't spin try changing the poles of the magnet until it spins and connect the power cord to the multimeter for measuring the electricity produced.
Connect the bulb to test. Enjoy!