What Is Tesla Coil? | The Definitive Guide

Tesla Coil

Wireless technology is widely used in our age. Today we use numerous wireless applications like lighting, wireless smart homes, wireless chargers, etc. from wireless-powered methods. In 1891, the great scientist Nikola Tesla discovered the Tesla coil.

Tesla is considered to be the passion of wireless technology so he invented this coil. The part of the circuit used in this coil is not as complex as the one we use in everyday life such as remote control, smartphone, computer, X-ray, neon, etc.

In today’s article, we will talk about what a Tesla coil is, what a working principle is, what are its advantages and disadvantages, and much more.

What is Tesla Coil?

What is Tesla Coil?

Tesla coil is a radio frequency-based oscillator. Which drives an air-core double-tune resonant transformer to produce high voltage with low currents.

To properly understand this let us define what a radio frequency oscillator is. We all know that an electronic oscillator is a device used to generate electrical signals of the sine wave or square wave. This electronic oscillator produces signals in the radio frequency range of 20 kHz to 100 GHz, also known as the radiofrequency oscillator.

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Circuit Diagram of Tesla Coil:

Circuit Diagram of Tesla Coil


The Tesla coil consists of two main coils, one primary coil, and the other secondary coil. Both of these coils have their own capacitors. The coil and capacitor are connected with the help of a spark gap The functionality of the spark gap is to generate a spark to stimulate the system. The functionality of the spark gap is to generate a spark to stimulate the system.

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Tesla Coil Working Principle:

How many million volts this coil will produce depends on the size of its coil. The Tesla coil works on the principle of achieving a state called resonance. Thus the primary coil produces a large amount of current in the secondary coil so that the secondary coil can be run with maximum energy.

The fine-tuned circuit helps to shoot the current from the primary to the secondary circuit at the tuned resonant frequency.

Tesla Coil Working:

This coil uses a special transformer known as a resonant transformer, a radio-frequency transformer, or an oscillation. The primary coil is connected to the main power supply. The secondary coil of the transformer is loosely connected to ensure that it resonates.

The capacitor connected in parallel with the transformer acts as a tuning circuit or LC circuit to generate a signal at a certain frequency.

A resonant transformer with a capacity between 2 kV and 30 kV is used to generate a high voltage in a transformer which in turn charges the capacitor. As the capacitor charges more, it eventually breaks the air of the spark gap. With the help of a capacitor Tesla coil (L1, L2) a large amount of current is emitted which in turn produces a high voltage at the output.

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Applications of Tesla Coil:

These coils do not require large complex circuits to produce high voltage. Small Tesla coils are used in various fields which are as follows:

  • This coil is used for car spark plug ignition.
  • In vacuum system leak detectors.
  • In high vacuum systems and arc lighters.
  • In aluminum welding.
  • Made fans of Tesla coils, used to make artificial lighting.

Tesla Coil Advantages:

The Advantages of the Tesla coil are as follows:

  • High performance.
  • Voltages build up at a slower pace so there is less chance of damage.
  • Distributes the same voltage across all winding coils.
  • Powers The use of 3-phase rectifiers for higher powers can provide tremendous load sharing.

Disadvantages of Tesla Coil:

The Disadvantages of Tesla coils are as follows:

  • Circuit construction takes a long time as it needs to be perfect to resonate.
  • Buying a larger DC smoothing capacitor involves more costs.
  • The high voltage radio frequency emissions in the Tesla coil pose many health risks. These include damage to the nervous system, skin burns, and the heart.

Most Commonly Asked Questions:

Most Commonly Asked Questions

What does the Tesla coil do?

The Tesla coil is a radio frequency oscillator that drives a resonant transformer to generate a high voltage at a low current.

Can a Tesla coil charge a phone?

Smartphones are released with built-in wireless charging, which uses the principle of a Tesla coil.

Is Tesla coil dangerous?

The coil and its equipment are very dangerous as they produce very high voltages and currents that cannot be ensured by the human body.

How did Tesla transmit electricity wirelessly?

A spark gap is used to connect the capacitors and two coils. As the power is fed in through a transformer, it produces the necessary current and powers the entire circuit.

Can a Tesla coil kill you?

This means that every part of the Tesla coil can be ruthless using large equipment such as power transformers while the system is in operation.

Are Tesla coils illegal? 

If the Tesla coil is capable of jamming the bandwagon, the Tesla coil could be seized by the FCC if it interferes with the legitimate use of the radioactive spectrum nearby.

Do Tesla coils hurt?

The high voltage and current are made using the normal voltage and current of the Tesla coil. The output voltage of the small coil is usually in the range of 500,000 to 1,000,000 volts. Because the burns are connected to frequencies, the Tesla coil can cause severe burns without any pain.

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My name is Tulip, and I am a contributor to electricalgang.com! As a contributor, I write articles on various topics related to electrical engineering, including product reviews, how-to guides, and tips and tricks.

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