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well you can make a generator from a old toy motor. for this you require some wood, two
old CDs, a toy motor, an LED and lots of other odds and bits. first make a wooden stand with
an arm. drill a hole and fix a screw over there. then take 2 CDs and sandwich some foam
rubber to make a large pulley. also attach a handle to this pulley. now take a sewing
machine bobbin and place it in the screw like a fat washer and then place the large pulley
and lock it with a small nut. rotate the pulley to ensure that it rotates smoothly. then take
a 9V toy motor or a tape recorder motor with a small pulley on the axle and attach it to
the base of the stand with two screws. you can see the white pulley on the toy motor.
finally take a rubber band and place it between the large and the small pulley. on rotating
the large pulley, small pulley will rotate much faster. now attach the two terminals
of the motor to an LED. once you rotate the large pulley, the LED will light up, because
the motor is now acting like a generator. you can put this LED in a bent straw and make
a street light. so once you rotate the large pulley, the LED lights up, the street light
glows. in this case an ordinary toy motor can be converted into a generator.