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A Tesla coil is a resonant transformer circuit invented by Nikola Tesla in 1891, designed to produce high-voltage, low-current, high-frequency alternating-current (AC) electricity. It operates on the principle of electromagnetic induction and resonance between two coupled coils—the primary and secondary—creating large voltage amplification. The system typically consists of a power source, a capacitor, spark gap, and two coils tuned to the same resonant frequency. When energized, the Tesla coil generates impressive electrical discharges, such as visible sparks and arcs, demonstrating the transmission of electrical energy through air without physical conductors. Today, Tesla coils are primarily used for educational demonstrations, wireless power experiments, and entertainment purposes, showcasing the principles of high-frequency electromagnetic fields.
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