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Physics Electromagnetism Induction
Transcript of Physics Electromagnetism Induction
Electromagnetic induction: "transfer of power between electric circuits: the transfer of power between one electric circuit and another caused by changes in the magnetic field linking them"
A changing magnetic field is necessary to induce a current in a nearby circuit.
Induced current- the current in a circuit due to a changing magnetic field.
Generator- a device that converts mechanical energy to electric.
Eddy Currents- spread-out current whirpools in a solid metal.
Magnetic Flux- is the quantity in Faraday's Law : O = B A
Michael Faraday discovered electromagnetic induction on August 29, 1831
Francesco Zantedeschi and Joseph Henry made similar discoveries in 1829 and 1830 (respectively), but did not publish their findings until later
"Faraday formulated that electromotive force produced around a closed path is proportional to the rate of change of the magnetic flux through any surface bounded by that path"
Faraday's experiment consisted of wrapping two insulated coils of wire around an iron ring, which resulted in mutual induction as a current passed through one coil resulted in a momentary current through induction
He also used magnets to test electric current
Induction that we learned in class
Charging by Induction: charging on object without touching it
How are they different?
NO physical connection between the conductor and the magnet
Consider a flat square coil with 5 turns. The coil is 0.50 m on each side and has a magnetic field of 0.5 T passing through it. The plane of the coil is perpendicular to the magnetic field: the field points out of the page. Use Faraday's Law to calculate the induced emf, if the magnetic field is increased uniformly from 0.5 T to 1 T in 10 s.
bring a charged object near neutral object (causes a separation of charges), then separating the object to be charged, trapping opposite but equal charges.
electromagnetism: electricity and magnetism are closely linked
E= induced voltage (V)
N= number of loops
O=Magnetic flux (Webers) = BA (mf*area)
t =time (seconds)
In Faraday's Law, systems don't like change and want to remain the same
Real Life Applications
Credit Card- the magnetic strip sores data in the form each surrounded by a magnetic field
Microphones- produce an electrical signal from air pressure variations.
Becker, J.F. "Electromagnetic Induction." San Jose State University. N.p., 2009. Web. 9 June 2014. <http://www.physics.sjsu.edu/becker/physics51/induction.htm>.
Deffree, Suzanne. "Faraday Discovers Electromagnetic Induction, August 29, 1831." EDN Network. N.p., 29 Aug. 2013. Web. 5 June 2014. <http://www.edn.com/electronics-blogs/edn-moments/4394972/Faraday-discovers-electromagnetic-induction--August-29--1831>.
"Electromagnetic Induction." Bing. Microsoft, n.d. Web. 5 June 2014. <http://www.bing.com/search?q=what+is+electromagnetic+induction&src=ie9tr&adlt=strict>. Bing dictionary
"Faraday's Magnetic Field Induction Experiment." Molecular Expression. N.p., n.d. Web. 5 June 2014. <http://micro.magnet.fsu.edu/electromag/java/faraday2/>.
Gerbis, Nicholas. "How Induction Cooktops Work." How Stuff Works. How Stuff Works, n.d. Web. 9 June 2014. <http://home.howstuffworks.com/induction-cooktops2.htm>.
"Magnetic Flux." Hyper Physics. N.p., n.d. Web. 9 June 2014. <http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/fluxmg.html>.
We hope you enjoyed this presentation! Big thank you to Ms. Barros for being an amazing teacher throughout this year!! xoxo