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Per17_over

# Per17_over - Preview of Period 17 Induction Motors and...

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Preview of Period 17: Induction Motors and Transformers 17.1 Induced Current How can we use induce current in a wire? 17.2 Generators How is electricity generated? 17.3 AC and DC Induced Current Is the induced current AC or DC? 17.4 Induced Magnetism How can the magnetic field of an induced current be used? 17.5 Induction Motors How do induction motors operate? 17.6 Transformers How does a transformer use induced current and magnetism to trade voltage for current? 17.7 Superconductivity and Induced Magnetism How can we use a superconductor to make a magnet “float”? 17-1

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Induced Current Moving charge (current) flowing through a wire near a magnet causes the magnet to move. The current induces a changing magnetic field around the wire. The changing magnetic field alternately attracts and repels another magnet. The interaction between these magnetic fields causes the motor’s rotor to spin . The opposite is also true. A moving magnet induces moving charge (current) in a wire. The moving magnet creates a changing magnetic field. The changing magnetic field induces a changing current in a nearby wire. The induced current in the wire induces a magnetic field around the wire. 17-2
Generators Generators convert kinetic energy into electrical energy A moving magnet creates a changing magnetic field. The changing magnetic field induces an electric current in a nearby wire. Motors convert electrical energy into kinetic energy.

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