Non Linear Resonance

If you have never experimented with coils and magnets, examine the discoveries of:

1. Founders of Magnetism & Early Electromagnetism

Hans Christian Ørsted (1820): Discovered that an electric current flowing through a wire creates a magnetic field, proving for the first time that electricity and magnetism are fundamentally linked.

André-Marie Ampère: Formulated the mathematical laws of electrodynamics and showed that electric currents exert forces upon each other (laying the groundwork for how coil windings interact).

Michael Faraday (1831): Widely celebrated as the "Father of Electromagnetism". He discovered electromagnetic induction (how a changing magnetic field produces an electric current) and built the earliest versions of dynamos and electric motors using coils. 

2. Pioneers of Coil Technology & Inductance

William Sturgeon (1825): Invented the first practical electromagnet by bending a piece of iron into a horseshoe shape and wrapping a few turns of bare copper wire around it, showing that iron cores drastically amplify magnetic fields.

Joseph Henry (early 1830s): Independently discovered electromagnetic induction alongside Faraday, but crucially discovered self-induction. Henry was the first to heavily insulate wire (using silk thread) so he could wrap multi-layered, tightly-wound coils packed closely together without short-circuiting them. His innovations created immensely powerful electromagnets, and the SI unit of inductance (the henry) is named in his honor. 

Rev. Nicholas Callan (1836): An Irish scientist and priest who invented the induction coil (the earliest prototype of the transformer) by wrapping primary and secondary wire layers around an iron core to step up voltages. 

Heinrich Ruhmkorff: Perfected and commercialized the high-voltage induction (spark) coil, making multi-layered secondary coil technology famous globally in the mid-19th century. 

Nikola Tesla (late 19th century): Advanced coil technology into high-frequency, high-potential domains with the invention of the Tesla coil—pioneering the resonant air-core configurations heavily referenced in alternative energy and modern wireless research today.