Chapter 8
Download
1 / 21

CHAPTER 8: - PowerPoint PPT Presentation


  • 145 Views
  • Uploaded on

CHAPTER 8: . MAGNETISM. 1) Magnetite is odd because when it swings freely, the same part would always face in the same direction. It's a natural magnet. 2) It gets its name from the Greeks living in Magnesia. 3) Magnetism=force of attraction or repulsion due to an arrangement of electrons.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' CHAPTER 8: ' - byrd


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Chapter 8

CHAPTER 8:

MAGNETISM







  • 8) N. mag pole--end of mag. that points N arrangement of electrons.  S. mag pole--end of mag. that points S9) Rule: like poles repel, opposites attract10) Nat. mag--naturally occurring substance that has mag. poles





  • 14) Hans Christian Oersted--in 1820, discovered electromagnetism by accident--was lecturing to physics class, noticed wire lying above compass, observed that when current flowed thru wire, needle was deflected, when current was reversd, needle moved in opposite direction, no electricity flowed, no movement by needle


  • 15) EM--relationship between electricity and magnetism electromagnetism by accident--was lecturing to physics class, noticed wire lying above compass, observed that when current flowed thru wire, needle was deflected, when current was reversd, needle moved in opposite direction, no electricity flowed, no movement by needle16) Electromagnet: made by wrapping coil of wire around soft iron core and passing an electric current thru the wire. Strength decreases/increases dep. on # of loops of wire. Also it's stronger if the current is higher/stronger.17) Lose properties by turning current off. Gain properties by turning current on.


  • 18)motor: converts elect. energy into mech. energy electromagnetism by accident--was lecturing to physics class, noticed wire lying above compass, observed that when current flowed thru wire, needle was deflected, when current was reversd, needle moved in opposite direction, no electricity flowed, no movement by needle  commutator: has special reversing switch that runs on DC, switches the direction of the current so that the mag. poles of the EM reverse and the EM spins  solenoid: wire wrapped into a cylindrical coil  galvanometer: used to detect small current




  • 21) increases or decreases voltage of AC the motion of a conductor in a mag. field; involves mag. lines of force.22) primary and secondary23) step up: increases voltage    step down: decreases voltage





  • 29) helps find direction based on earth's mag field; needle always pts N.Compass points to mag poles, not geographic poles--Mag N pole--NE Canada, abt 1600km from GNP; Mag S pole--Antarctic Circle30) magnetic variation: error in compass caused by it reading the magnetic N instead of the geographic N.



ad