| What is Electromagnetic Induction? | -This is when Potential Difference is Induced [Created] across a Conductor, while its involved with a Change in the External Magnetic Field [Literally another Magnet] |
| How can the Conductor experience a change in Magnetic Field Terms? | -Simply when it passes through Magnetic Field Lines |
| If a Conductor, that got induced Potential Difference, was in a Circuit, what can happen? | -The Induced Potential Difference can make a Current in the Circuit
-This Current will create its own Magnetic Field, and this Magnetic Field will go against the External Magnetic Field |
| How can Electromagnetic Induction happen? | -When an Electrical Conductor and a Magnetic Field are close together
-When the Magnetic Field through a Conductor Changes [Bigger, smaller or Reverse] |
| What do Generators do, simply? | -Use the Motion of the Conductor and Magnetic Field to create a Potential Difference and Current |
| What are the 2 main Principles of Generators? | -If the Direction of the Rotation changes, so the does the Direction of the Potential Difference/ Current
-The Current Induced will become Larger if their is more Turns on the Coil, Magnetic Flux Density increases or the Speed of Rotation increases |
| Alternators, What are they, and how do they do that? | -Alternators make Alternating Current
-This can happen by Rotating a Magnet in a Coil of Wire
-During the Magnets Spins, a Alternating Pd is Induced at the Ends of the Coil. The Potential Difference changers Direction around every Half Turn because the Field Change also changes Direction
-This makes an Alternating Current
-You can also get an Alternating Current, by Rotating a Coil in a Magnetic Field
-Slip Rings are attached to the Ends of the Coil which can stay in touch with Brushes that is in touch with the rest of the Circuit.
-This also means the Contacts do not Swap every half turn, so AC is Produced |
| Dynamos, What are they, and how do they do that? | -Dynamos make Direct Current
-They Rotate a Coil, in a Magnetic Field
-Induced Potential Difference and Current changes Direction every Half Turn. However
-Split-ring Commutator swap the Connections every Half turn, which ensures the Current stays in the Same Direction |
| Microphones, Structure? | -Like one of a Loudspeaker, but has a Diaphragm instead of a Cone |
| Explain how the Microphone works | -Sound waves make the Diaphragm move Back and Forth
-This movement of the Diaphragm makes the Coil of Wire move, which Induces a Potential Difference in the Ends on the Wire
-The Coil joins the Circuit, so the Induced Potential Difference makes Variaitons in the Current |
