Step 2: Making the holder for the coil

1. Use a single coil sire and twist it into a loop.
  • make sure the loop is hanging down, to ensure contact between the expose srea of the copper wire.

2. secure 2 loops to the terminals of a power source. (up to you to decide)
  • I am using aonly a 2V dry fitt battery.

We made kits for our Scout Pack, similar to instructions at <a rel="nofollow" href="http://www.uen.org/Lessonplan/preview.cgi?LPid=2701">http://www.uen.org/Lessonplan/preview.cgi?LPid=2701</a> This plan uses D cell batteries as the power source and they double as being the right size to wrap the coil. They were built on top of paper coffee cups (the local Starbucks CHARGED me for fifteen empty cups, but they were just the right size and didn't slope as much as others) Then I saw the HowToon at <a href="http://www.instructables.com/id/E8CC8DU4IYEP2866C2/">http://www.instructables.com/id/E8CC8DU4IYEP2866C2/</a> for an even simpler setup. This would be a great class project. The kids can take them home and show mom and pop what they learned! In the HowToon they scrape the entire wire end and then put finger nail polish over one side. We achieved the same result by using a couple of coats (dry in between coats) of permanent markers, which would be a lot less messy and somewhat less smelly. A super simple motor is at <a rel="nofollow" href="http://www.makezine.com/blog/archive/2006/08/how_to_make_the_simplest_elect.html">http://www.makezine.com/blog/archive/2006/08/how_to_make_the_simplest_elect.html</a><br/>
You forgot to mention the magnet that needs to be below the coil. Kind of important. This is described with more detail here:<br/><a rel="nofollow" href="http://sci-toys.com/scitoys/scitoys/electro/electro.html">http://sci-toys.com/scitoys/scitoys/electro/electro.html</a><br/>
also, it helpful to mention that the wire shown in the picture is actually insulated. The insulation is a film on the surface of the copper. You're only supposed to scrape off the insulation from the two 'arms'. And when you scrape off that insulation you only scrape it off of one cemicircle of the wire: #########| original wire with insulation #########| ``````````````| wire with half insulation scraped off #########| The half which is scraped off should be the same half on each arm (make sure the uninsulated parts of the two arms face the same way)
Here's a simple electric motor I made to show our Physics students the basic principles. The coil was the trickiest part, I made this by winding the wire around a plastic pipe and glueing it in place. Balancing the coil was quite tricky too as the coil is pretty delicate, hence I intergrated an upside-down jamjar into the construction to protect the motor from inquisitive students.

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