1 / 16

Magnetism from electricity

Magnetism from electricity. Magnetism from electricity. In 1820, Danish scientist Han Christian Oersted discovered accidently that when electricity passed through a wire…a magnetic field was created. Which way would the compass needles point if we placed them around the wire?.

whitney
Télécharger la présentation

Magnetism from electricity

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Magnetism from electricity

  2. Magnetism from electricity • In 1820, Danish scientist Han Christian Oersted discovered accidently that when electricity passed through a wire…a magnetic field was created

  3. Which way would the compass needles point if we placed them around the wire?

  4. Without a current….with a current A magnetic field is induced by the current

  5. Electromagnet • A current carrying coil of wire with many loops is called an electromagnet

  6. Superconducting electromagnets The most ignominious military use of superconductors may come with the deployment of "E-bombs". These are devices that make use of strong, superconductor-derived magnetic fields to create a fast, high-intensity electro-magnetic pulse (EMP) to disable an enemy's electronic equipment. Such a device saw its first use in wartime in March 2003 when US Forces attacked an Iraqi broadcast facility. 

  7. Magnetism and Electricity are related Magnetism from Electricity Electricity from Magnetism • Many moving charges (an electric current) produce a magnetic field

  8. Question of the day If you can make a magnet from electricity, can you also make electricity from a magnet?

  9. Michael Faraday • It was largely due to his efforts thatelectricity 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

  10. Electricity from Magnetism

  11. 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

  12. REVIEW • Which moves to create current? The wire or the magnet?

  13. 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)

  14. What can you do to create more current? Faraday’s Law • Increase the # of loops • Make the magnet or wires move faster

  15. “The Great Revolution”…Einstein • http://www.youtube.com/watch?v=TEVEBzNSwTU • And part 2

More Related