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Transcript
Test over Magnetism- Friday Agenda for the day • Lecture- Magnetic Induction • Finish Lab from yesterday… Making an electromagnet…turn in Finish coloring magnetsphere…turn in Question of the day If you can make a magnet from electricity, can you also make electricity from a magnet? Michael Faraday • It was largely due to his efforts that electricity became practical for use in technology. His efforts created the “ancestor” of the electric motor and generators. • Discovered electromagnetic induction (1831) ….which was a turning point in physics Electricity from Magnetism Current is induced by changing the magnetic field • Consider that there is no power source, but if you move the magnet or move the wire…current in created REVIEW • Which moves to create current? The wire or the magnet? Does this mean we get something (energy) for nothing? • The law of conservation of energy states that the Force times the distance traveled = Work done… • Work input = work output (or energy stored) What can you do to create more current? Faraday’s Law 1) Increase the # of loops 2) Make the magnet or wires move faster “The Great Revolution”…Einstein • http://www.youtube.com/watch?v=TEVEBzNS wTU • And part 2