At an Expo, Tesla walked around the crowd wearing clothes made of special materials and wooden shoes on his feet. He kept flashing purple arcs and making a "beep" sound, and people were far away from him. This is artificial lightning, using Tesla coil to generate lightning. This is a very interesting device, and there are still many fans of Tesla coil. It is actually a high-voltage transformer, which boosts the low-voltage electricity through two sets of coils.
Lightning happens all the time in nature. When lightning strikes objects on the ground in the sky, it releases a voltage as high as 1 100 million volts, resulting in a high temperature of 30,000 degrees Celsius, which is equivalent to 6 times the surface temperature of the sun. It is extremely powerful, but the lightning generated by Tesla coil can make people read books under it safely. Once, Tesla was seen playing with two lightning balls in his hand. It can be seen that Tesla's artificial lightning will not cause harm to human body.
Why is this happening? According to the electric power formula P=UI, when the power is constant, the higher the voltage, the smaller the current flowing through the circuit. In the artificial lightning of Tesla coil, the secondary voltage is as high as millions of volts, and its current is only a few milliamps or even less, so it is harmless to people. Now many enthusiasts can make Tesla coils. When they approach this coil with their hands, there will be a purple arc discharging to their hands, but their hands are nothing.
Tesla wants to use artificial lightning for wireless transmission, which saves the trouble of wired transmission. Once, he put a fluorescent lamp near the coil, and the lamp didn't need to be connected with wires. After approaching the coil, the light came on. He thinks he has found a way to transmit electricity wirelessly. 1892, Tesla came to Europe to show his experiment, and he even made a prediction: in the future world, electric energy can be transmitted wirelessly.
1895, Tesla designed wireless power transmission to West Point Military Academy, 50 miles from new york. He developed a huge conical coil that can release a voltage of one million volts. But before the experiment started, a fire broke out in the laboratory and all the equipment was set on fire. Since then, Tesla has been greatly weakened, and the wireless power transmission experiment was interrupted. The powerful Tesla rebuilt the laboratory and continued to study electrical phenomena. He broadened his horizons and thought that the whole universe was a huge energy.
British engineer Marconi draws lessons from the electric resonance principle of Tesla coil. When the coil devices with the same frequency receive weak electrical signals from each other at different places in a long distance, the coil devices will have resonance effect. Using this principle for long-distance communication, the content sent by the other party can be interpreted by receiving and decoding the electrical signal. This is the principle of telegraph.
1899, Tesla came to Kequan City, Colorado to conduct a secret experiment here. He continued to study lightning in the laboratory in the suburbs. He believes that lightning is a phenomenon in which charges propagate in the air and can be used for wireless transmission. He built a giant Tesla coil bigger than before. Late one night, Tesla began his experiment. The antenna of the giant coil emits artificial lightning more than 100 feet long, triggering.
Financial giant Morgan saw the immeasurable value of wireless communication and invested in Tesla to build a global communication center. However, Tesla aims to develop a practical wireless transmission system on a global scale. He implemented his Wodencliffe tower project in Long Island, but Marconi has successfully implemented overseas telegraph communication. Morgan withdrew its investment in Marconi, and Tesla's research on wireless transmission was terminated. According to the current common sense, radio can transmit weak electric signals over a long distance, but it needs to transmit high-power electric energy.