Make a generator using a 12-volt DC motor. . Fix and solder a LED to a 12-vold DC toy motor. Attach a pulley to the shaft. On twirling the pulley the motor will rotate and the LED will glow. So, a toy motor can also be used to generate a small amount of electricity.
http://www.arvindguptatoys.com/toys/generator.html This work was supported by IUCAA and Tata Trust. This film was made by Ashok Rupner TATA Trust: Education is one of the key focus areas for Tata Trusts, aiming towards enabling access of qualit
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