How to make a simple electric generator

The generation of electricity is a process that has been perfected over time. One of the most attractive science experiments is the creation of electricity generators from magnetism. However, basic modification of the classic winding and magnet assembly can create more efficient generators using small motors. In the following, we will look at how to make a simple electric generator based on classical concepts, but modifying the traditional dynamo with a small motor.

electric generator


- Conductive wire.

- Nails, bolts and nuts.

- One or more LED's.

- A couple of old CDs.

- A soda straw.

- A 9V motor that we can take out of an old tape recorder.

- Thread or sewing machine spool.

- Piece of cardboard.

- Wooden rod.

- Square, flat piece of wood.

Assembling our simple electric generator

The first thing we are going to do is to fix the electrical connections of the motor to pieces of wire with the help of a tin soldering iron. We pass each wire through the inside of the straw, connect the free ends of the wires to the connector ends of the LED and fix the LED to the straw. In this way, we will create a kind of lamp to test the operation of the generator.

Simple generator

Now, it is time to create the pulley. To do this, with the help of scissors we create a cardboard disc with similar dimensions to the CD's, but with a smaller diameter, and with the same hole in the middle (with the help of glue) we fix the CD's to the cardboard disc creating a kind of pulley, and we fix in the middle hole the thread spool that will serve as a rotation axis.

We fix with the help of a nail the wooden rod to the square piece (Base), and in the upper part of the rod, with the help of a drill, we create a hole through which we can introduce a screw that we will adjust with nuts to obtain a rotation axis for the CD's pulley. We place the pulley on this shaft and the generator is almost ready.

Simple generator

Now, with the help of an elastic (rubber band) we connect the CD pulley to the small motor pulley and we will have ready our generator. Once we start the movement with the large pulley we will see the LED light up.

16 thoughts on “Cómo hacer un generador eléctrico sencillo”

  1. The mechanism is simple but effective. I suppose that the voltage generated will be something like 1.5 v or less (depending on the revolutions), as it is something very, very simple. This voltage could be increased either by increasing the revolutions (for this we simply invent anything to make the driving pulley turn faster) or by improving the driving wheel, because with the existing one it would be quite difficult to achieve a lot of rpm (revolutions per minute), as it is a bit delicate. Even improving the driving wheel, the V that would be generated would not exceed 9 V because it is the maximum capacity of the motor, so for this mechanism it would be good to connect the motor to a battery instead of connecting it to a led, so the battery would fill up and we could connect whatever we wanted to it (without exaggerating).

    Anyway, for users who just want to try things out, this mechanism will be great, for those who want to go further, they could use this same method but changing the motor for one that admits more V (so that the battery charges faster or so that we can connect some device directly) and improve the drive pulley (so that it gives more revolutions).

  2. Do you know the voltage, it could be 1.5V. If so, I would like to increase it.

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