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2. Induction coil - Wikipedia

   en.wikipedia.org/wiki/Induction_coil

   To operate the coil continually, the DC supply current must be repeatedly connected and disconnected to create the magnetic field changes needed for induction. [1] To do that, induction coils use a magnetically activated vibrating arm called an interrupter or break (A) to rapidly connect and break the current flowing into the primary coil. [1]

3. Tesla coil - Wikipedia

   en.wikipedia.org/wiki/Tesla_coil

   Two coil or double-resonant circuits: Virtually all present Tesla coils use the two coil resonant transformer, consisting of a primary winding to which current pulses are applied, and a secondary winding that produces the high voltage, invented by Tesla in 1891. The term "Tesla coil" normally refers to these circuits.

4. Electromagnetic induction - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_induction

   Electromagnetic or magnetic induction is the production of an electromotive force (emf) across an electrical conductor in a changing magnetic field. Michael Faraday is generally credited with the discovery of induction in 1831, and James Clerk Maxwell mathematically described it as Faraday's law of induction.

5. Inductance - Wikipedia

   en.wikipedia.org/wiki/Inductance

   Electromagnetic induction was first described by ... and are the inductances of the primary and secondary coil, respectively, and is the mutual ...

6. Faraday's law of induction - Wikipedia

   en.wikipedia.org/wiki/Faraday's_law_of_induction

   Faraday's law of induction (or simply Faraday's law) is a law of electromagnetism predicting how a magnetic field will interact with an electric circuit to produce an electromotive force (emf). This phenomenon, known as electromagnetic induction , is the fundamental operating principle of transformers , inductors , and many types of electric ...

7. File:Early induction coil, 1838.jpg - Wikipedia

   en.wikipedia.org/wiki/File:Early_induction_coil...

   English: Early induction coil, 1838, by Charles G. Page (US). Exhibit in National Museum of American History, Washington, DC, USA. The arm dipping into the glass cup was an early "contact breaker" or "interrupter" which repeatedly broke the current to the primary to create the flux changes needed for induction. The cup was filled with mercury ...