Faraday's Experiments and Applications

   
                                                                                         
                                                Electromagnet                                 


                                                                                         best                    generator
                                     Electromagnets have iron cores wrapped with wire.                                       Emf induced in rod traveling through magnetic field by Michael Faraday                                           Electrical Generator
                               http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/elemag.html                 http://www.s-cool.co.uk/a-level/physics/lenzs-law/revise-it/lenzs-                     https://www.boundless.com/physics/textbooks/boundless-physics-textbook
     How do Magnets work? The underlying aspects of magnetism consist of the science of magnetic fields. Magnets have magnetic fields that push and pull objects toward and way from them. When an electron moves it generates a magnetic field with two poles north, and south respectively. Science cannot explain why this happens yet, it's just a factor of the universe that exists. However, we do know that opposites attract. The north pole attracts the south pole, and two of the same poles will resist each other.

Electro-Motive Forces
(EMF)—The voltage generated by a battery or by the magnetic force according to Faraday's Law. It is measured in units of volts, not newtons, and thus, is not actually a force.

Electrical Generator
Electric generators are devices that convert mechanical energy to electrical energy. They induce an electromotive force (EMF) by rotating a coil in a magnetic field. It is a device that converts mechanical energy to electrical energy. A generator forces electric charge (usually carried by electrons) to flow through an external electrical circuit.

Rod Traveling Through a Magnetic Field
 The rod will move across the field and cause an electrical current and a change in flux as well. This change in flux over time can be measured and modeled by the EMF equation. The direction of motion of the rod is acting perpendicular to the direction of the flux.

If the flux changes, an emf will be induced. There are therefore three ways an emf can be induced in a loop:

  1. Change the magnetic field
  2. Change the area of the loop
  3. Change the angle between the field and the loop

We can apply Faraday's law and the right hand rule to find out which direction the emf, flux and magnetic field are going.



»