In the international system of units, the unit of magnetic induction intensity is Tesla coils (20), abbreviated as T, which is the derived unit of magnetic flux density or magnetic induction intensity in the international system of units. When a current of 1 amp flows through a conductor perpendicular to the magnetic field and the force of the magnetic field is 1 Newton, the magnetic induction intensity of the charged conductor is 1 Tesla. Generally, the magnetic induction intensity near the permanent magnet is about 0.4-0.7 tex. In the iron cores of motors and transformers, the magnetic induction intensity can reach 0.8- 1.4 tex, and the magnetic induction intensity of strong current passing through superconducting materials can reach 1000 tex, while the magnetic induction intensity of near-surface geomagnetic field is only about 0.5* 10 -4 cubic tex.
Tesla was a rare experimental generalist at the beginning of last century. He has patented achievements in electromechanical engineering, radio engineering, fluid engineering, cryogenic engineering, geophysics, vacuum technology, aircraft technology and so on. Tesla's patents in various countries, including all his unapproved patents and various inventions with patent value, add up to more than 700. Tesla is not only a scientist devoted to exploring and grasping unknown natural phenomena, but also a skillful craftsman. Some of his experimental results, such as artificial spherical lightning, can't be imitated even by the most advanced equipment today. Tesla's most valuable achievement is the discovery of the principle of rotating magnetic field and the invention of multiphase AC power supply system and AC induction motor. His most famous invention is "Tesla coil", which is a distributed parameter high-frequency vibration transformer, which can obtain millions of volts of high-frequency voltage. He was one of the first scientists who successfully manufactured fluorescent lamps and discovered and studied X-rays. He first discovered ruby laser effect and point electron microscope effect. Tesla is also the originator of radio remote control. For the first time, he realized the logic principle of computer "AND gate" by using resonant circuit and expounded the principle of radar for the first time. For the first time, he also used a self-made high-sensitivity receiver to receive radio pulse signals from outer space, detected cosmic rays and invented a revolutionary bladeless turbine.
In order to turn his idea into a real invention, he doesn't want to sleep. He only slept for more than 2 hours every day, and finally got more than 1000 invention patents on his own.