An electrical circuit is a closed loop through which electricity can be passed. Using simple equipment and techniques, you can make a wide range of working models including a windmill. Such projects are popular in schools in the UK and Ireland, as children are required to become familiar with simple circuits. These projects are both fun and educational, according to science teacher Gary Gibson.
- Skill level:
- Moderately Easy
Things you need
- Red and black wire
- Crocodile clips
- Wire stripper
- Small screwdriver
- 0.5 to 6 volt DC Motor
- 6 volt battery
- Plastic windmill sails
Strip the end of a red wire about 20 cm long with a wire stripper, removing about 1 cm of plastic sheathing from the end. Thread the stripped end through the small conduit of a crocodile clip. Slacken the screw. Wrap the wire around the screw. Tighten the screw. Repeat the whole process with a black wire and another crocodile clip. Using wires of different colours is not strictly necessary for a simple project like this. However, it is a good idea to establish the colour coding system with children, so use red for positive and black for negative.
Connect the other ends of the two wires to an on-off switch. Choose one with manual screw terminals if possible, as you can easily unscrew the plastic nuts by hand, wrap the wires around the terminals (red to red and black to black) and tighten the nuts again. A switch is not essential in the system but it will give you more control over the windmill model.
Run wires from the switch to a 0.5 to 6 volt DC Motor. This has a rotating central shaft. Fit your plastic windmill sails onto this shaft.
Put the switch in the off position. Connect the crocodile clips to the battery, one to each terminal, following the colour code. Put the switch in the on position. The motor will start up and the windmill sails will start rotating.
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