What do you need to build a motor, and the function of it:
It is amazing to find out that to build a simple motor you only need: paper clips, a battery, copper wire and a magnet. With a motor like the one we built in class you could build things like a blander, a fan or anything else that relies on a spinning axle.
http://www.cindyronzoni.com/tag/paper-clips
The paper clip is used for two reasons; To conduct current from the battery to the copper loop and also to hold it above the magnet.
The battery provides the current that is conducted by the paper clips to the copper wire.
The copper wire is used to create a loop that is held above a magnet. A current flows through the paper clips on each side of the battery to the copper wire, which completes the circuit.
The magnet creates a magnetic field that works to works with the current to form the force that will cause the copper wire to spin.
Why does it work?
The Picture above gives a visual representation for the reason why the copper wire is forced to spin. Like we said before the battery provides a current that is conducted by the paper clips to the copper loop. That current moves through one side of the loop and back through the other. The magnet is placed on top of the battery (under the loop) and creates a magnetic field that points up. If we use the rule that is exemplified by the hand above we can find out which way the force, resulting from the current and the magnetic field (A current carrying wire feels a force in a magnetic field), will push. That is the way we can determine where to scrape the armature. This step, which does not seem too important, is a main component in the function of the motor. By using the finger rule we decided to scrape when one side of the loop is vertical to the battery, because that is when the force would push the loop in a way that it would cause it to turn. Here is a link of my motor!
http://www.youtube.com/watch?v=ZmY9sdaeWWI
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