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Unformatted text preview: Matt Karam PHYS 214- 10 April 3, 2008 Come one baby light my fire! And then rebuild a motor that runs properly... 1. Goals: To build and test an electrical motor based on our knowledge of electromagnetic forces and physics. Utilizing an oscilloscope we will test the motors we construct as to their efficiency and power, including operating RPM and voltage. 2. Theory: A motor begins working through construction composed of a wire coil around an axel, which freely rotates from that point over a magnet. As the coil rotates commutator wires provide a current into the coil that provides an orthogonal push that causes the coil to rotate on the axel. Inertia keeps the coil spinning until the coil comes close to the magnet again, at which point the commutator wires have switched their polarity and now the current in the wire has switched direction and the coil is pushed the same direction as it was before. This process continues as the motor spins of current direction changing as the coil moves over the magnet so that the relative...
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