In the pages of history, there's a person who both amazes and sometimes disappoints us - Nikola Tesla. He's the smart guy behind cool things like the remote control and alternating current. Forget boring textbooks - we're cracking open his secret vault, revealing 20 mind-blowing inventions that never quite saw the light of day. Tesla Coil Invented by Nikola Tesla in 1891, the Tesla coil is a groundbreaking electromagnetic amplifier. This hidden creation generates electricity with high voltage, low voltage, and alternating current. Tesla ingeniously experimented with paired resonant electric circuits, exploring realms such as electrical lighting, X-ray generation, and wirelessly transmitting electrical energy. Originally featuring spark gaps, these coils evolved to employ modern electronic devices for switching actions. Operating as radio frequency oscillators, Tesla coils harness air-core double-tuned resonant transformers, producing staggering voltages of several million volts. Today, these marvels find application in entertainment and education, though their historical significance spans spark-gap radio transmitters and medical electrotherapy. Tesla's covert innovation remains an emblem of technological prowess, showcasing the evolution from spark gaps to electronic oscillators in this electrifying invention. Wireless Power Transmission Often overshadowed by Thomas Edison's fame, remains a groundbreaking discovery. Contrary to conventional beliefs, Tesla's alternating AC currents proved superior for electricity conduction. In his Wardenclyffe Laboratory, Tesla conducted wireless power experiments, transmitting currents through plastic using magnetic induction, challenging the need for metal contact. Employing radio frequency resonance, Tesla demonstrated wireless lighting of bulbs and explored long-distance transmission with LC circuits. His visionary ideas included using the Earth as a conductor for global electricity. While he faced obstacles, Tesla's foresight on wireless communication's global impact proved accurate. Today, his resonant inductive coupling method finds application in short-range wireless systems, and the suppressed potential of Tesla's wireless power research remains an untapped resource for future technological advancements in the evolving landscape of AI technology.