Electromagnetic waves will spread outward, and the efficiency will drop rapidly, because it follows the inverse square law of distance. If you want to build a one-megawatt wireless power transmitter, you must always inject 1 megawatt power into it, even if the power terminal only wants to receive 10 watt power from it. But it is possible to realize wireless power transmission in a short distance, and this technology already exists. 20 15 Mitsubishi heavy industries of Japan lit a light bulb 500 meters away through wireless transmission technology. However, this technology is different from Tesla's method.
The former uses microwaves to concentrate electric energy and transmit energy. Tesla imagines the earth as a transmission conductor. Through the Tesla coil on the ground, the AC electric pulse is transmitted to the resonant cavity and ion ball on the ground to form electromagnetic vibration, so the electric energy can continue to spread in the atmosphere with very little power loss. Anywhere on the earth, as long as there is a similar resonant capacitor antenna, you can receive alternating current in the air. To this end, Tesla built a large-scale high-voltage wireless power station at 190 1, which is now called Walden Crever Tower.
He wants to try long-distance wireless transmission and wireless broadcasting. Because wireless transmission and wireless broadcasting are essentially the same, both depend on the transmission and reception of radio waves. However, because the long-distance wireless broadcasting technology was originally realized by Marconi, the construction of Walden Lake Building lost its financial support. Soon after, the Walden Tower was demolished, and Tesla still failed to conduct long-distance wireless transmission experiments. Tesla's wireless transmission principle uses a global electromagnetic vibration called Schumann vibration.