User:GaryPeterson/World Wireless System
From Wikipedia, the free encyclopedia
Wireless energy transfer or Wireless power is the transmission of electrical energy from a power source to an electrical load without interconnecting wires. Wireless transmission is useful in cases where interconnecting wires are inconvenient, hazardous, or impossible. A form of wireless power exists today,[1] in that radio transmissions are carried by the energy of electromagnetic space waves to radio receivers.[2] The problem of wireless power differs from that of wireless telecommunications, where the signal-to-noise ratio (SNR) or the percentage of the transmitted energy received becomes critical only if it is too low for the signal to be demodulated. With wireless power the system's efficiency is the more significant parameter. A large part of the energy sent out by the generating plant must arrive at the receiver or receivers to make the system economical.[2]
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The most common form of wireless power transmission is carried out using inductive coupling followed by resonant inductive coupling. Other methods include electromagnetic radiation in the form of microwaves and lasers. While practical industrial wireless power transmission by electromagnetic radiation is only a remote possibility[3][2] designs for such systems are presently being considered.[4]