File:TeslaEffect.png

Summary
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Description
Wireless energy transfer also known as wireless energy transmission is the process that takes place in any system where electromagnetic energy is transmitted from a power source (such as a Tesla coil) to an electrical load, without interconnecting wires. A "world system" for "the transmission of electrical energy without wires" that depends upon the electrical conductivity of the earth was proposed by Tesla in 1904. The Tesla effect (named in honor of Nikola Tesla) is an archaic term for an application of a type of electrical conduction (that is, the movement of energy through matter; not just the production of voltage across a conductor). Through longitudinal waves, an operator uses the Tesla effect in the wireless transfer of energy to a receiving device.

Image source
Martin, T. C., & Tesla, N. (1894). The inventions, researches and writings of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting. New York: The Electrical Engineer. Page 188.