After testing our strength in the garden yesterday, we decided to test our brains today by building a torch. We used a kit made by Green Science to make a dynamo torch. It uses a very simple motor invented by Michael Faraday in the 1800's and gear chains similar to the ones we saw in the Leonardo Da Vinci Museum.
If you want to make a dynamo torch, here's how Libby and I made it
YOU WILL NEED:
dynamo torch casing and accessories
a transparent torch cover
a toy motor
two gears and an axel
a LED lamp with holder and wires connected
HOW YOU MAKE IT:
1. We laid out all our pieces from the kit on a tray to prevent losing any of the pieces.
2. Next, we put our the wires from the LED light through a hole and we secured it in place.
3. Then, we attached the gears to the torch casing and screwed it together with 6 of our 10 screws.
4. After this, we screwed the handle to the torch casing connecting it to the gears.
5. Following this, we carefully twisted the wires from the LED light to the motor making sure we had a secure connection so that the circuit was complete.
6. When this was done, we inserted the motor into the torch casing and secured it with screws.
7. Finally, we placed the transparent cover over the LED bulb and tested it. It worked!!!
When we had finished making it we learnt that the motor works by turning the handle, which rotates a wire in the middle of two magnets generating an electric current. This is called electromagnetic induction. The electric current, which is measured in volts, then lights the LED bulb. The faster we turned the handle, the greater the voltage of electricity produced, the brighter the LED bulb shines.