Nikola Tesla (“Beam me up”, October 15) is most remembered for two inventions: the transformer and the three-phase induction motor.
These, along with synchronous generators, have formed the backbone of the worldwide AC electric power system that is arguably the largest technology industry in the world. It mostly operates at 50-60Hz, extremely low frequencies (ELF) on the electromagnetic spectrum.
This system has stood the test of time and allowed economies all over the world to develop. In 2000, the US National Academy of Engineering compiled a list of 20 marvels of science and engineering that had the greatest influence on quality of life in the 20th century. The first item on the list was electrification.
Tesla is also remembered for his “Tesla coil”, which transmits electrical energy at radio frequencies. It is more of a fun technology than a serious energy transmitter.
The idea of beaming electric power at high frequencies was also one of Tesla’s visions and, according to what I have read, he “beamed” electrical energy wirelessly in a
