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Tesla's Coil

Short answer: A Tesla coil is a resonant transformer invented by Nikola Tesla around 1891. A capacitor discharges through a primary coil of a few turns, and the oscillating magnetic field induces current in a secondary coil of many turns; resonance between the circuits builds very high voltage at high frequency.

At the top terminal the voltage ionizes air and throws sparks. The footage shows a Tesla coil discharging.

VideoWrite-up1 sources
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What should you know about Tesla's Coil?

Quick facts. Each one stands alone and has a stable ID you can cite.

  1. Nikola Tesla, about 1891.

    DD-405-F01 · Write-up · Exhibit A (Inventor)

  2. Primary and secondary.

    DD-405-F02 · Write-up · Exhibit B (Circuits)

Video transcript: Tesla's Coil: A Tesla Coil Steps up Voltage Until the Air Itself Sparks

Did you know? Tesla coils work by generating high-voltage, high-frequency electricity using two coupled circuits, a primary and a secondary. The primary circuit includes a power source, a capacitor, and a coil. When the capacitor discharges, it sends current through the primary coil, creating a magnetic field. This field induces a current in the secondary coil via electromagnetic induction, significantly amplifying the voltage due to the secondary coil's higher number of turns. The resulting high-frequency alternating current travels to the terminal, where it ionizes the surrounding air. NOW YOU KNOW!

Burned-in captions, read frame by frame (see transcript.md) · 29.6s Reel ·

Video coming soonTesla's Coil · Instagram Reel
Tesla's Coil: A Tesla Coil Steps up Voltage Until the Air Itself Sparks Instagram Reel · · 29.6s

The write-up

A Tesla coil steps up voltage until the air itself sparks. Nikola Tesla invented it around 1891.

  1. Exhibit A

    Inventor

    Nikola Tesla, about 1891.

  2. Exhibit B

    Circuits

    Primary and secondary.

  3. Exhibit C

    Induction

    Magnetic coupling.

  4. Exhibit D

    Resonance

    Builds voltage.

  5. Exhibit E

    Sparks

    Air ionizes.

Questions people ask about Tesla's Coil

Who invented it?

1891.

Source: Write-up · Exhibit A (Inventor) · Wikipedia: Tesla coil

What couples the coils?

Fields.

Source: Write-up · Exhibit B (Circuits) · Wikipedia: Tesla coil

Which coil has more turns?

Steps up.

Source: Write-up · Exhibit C (Induction) · Wikipedia: Tesla coil

What makes sparks?

Breakdown.

Source: Write-up · Exhibit D (Resonance) · Wikipedia: Tesla coil

What discharges into the primary?

Stored charge.

Source: Write-up · Exhibit E (Sparks) · Wikipedia: Tesla coil

Test Your Knowledge

All quizzes →

5 questions, all from this case file. Answers are revealed instantly.

  1. Who invented it?

    1. Nikola Tesla
    2. Thomas Edison
    3. Michael Faraday
    4. Benjamin Franklin
    Show the answer

    Answer: A. Nikola Tesla 1891. Source: Write-up · Exhibit A (Inventor) · Wikipedia: Tesla coil

  2. What couples the coils?

    1. Magnetic induction
    2. Wires only
    3. Light
    4. Water
    Show the answer

    Answer: A. Magnetic induction Fields. Source: Write-up · Exhibit B (Circuits) · Wikipedia: Tesla coil

  3. Which coil has more turns?

    1. Secondary
    2. Primary
    3. Equal
    4. Neither
    Show the answer

    Answer: A. Secondary Steps up. Source: Write-up · Exhibit C (Induction) · Wikipedia: Tesla coil

  4. What makes sparks?

    1. Ionized air
    2. Fire
    3. Magnets
    4. Batteries
    Show the answer

    Answer: A. Ionized air Breakdown. Source: Write-up · Exhibit D (Resonance) · Wikipedia: Tesla coil

  5. What discharges into the primary?

    1. A capacitor
    2. A battery only
    3. A generator only
    4. A spark plug
    Show the answer

    Answer: A. A capacitor Stored charge. Source: Write-up · Exhibit E (Sparks) · Wikipedia: Tesla coil

Cite this case file

Easterling, Marcus. "Tesla's Coil." The Detail Department (DetailEnjoyer), case file DD-405, last updated Dec 3, 2024. https://detailenjoyer.com/case/teslas-coil/

Permalink: https://detailenjoyer.com/case/teslas-coil/ · Last updated

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