Wireless electricity is safe for humans

In the future, the transmission of electrical power to electrical equipment will not require wiring, which is considered to be relatively safe for human use.

In 1899, a Serbian engineer named Nikola Tesla built a 50m high wire winding, carrying 12 million volts of electricity in Colorado Springs and transmitting electricity wirelessly through the air, lighting up 200 lightbulbs. After turning on the switch, the lightning bolt goes out of the coil but no one is hurt.

Nikola Tesla in the lab with millions of volt electric transmitters. (Photo: Corbis)

Perhaps wireless electricity is safe, even if it runs through our toes. Tesla's experiments have shown that the Earth itself can be used to conduct electricity, without the need for cables. He also experimented with electromagnetic induction, a physical phenomenon discovered 70 years ago by scientist Michael Faraday, Popsci said.

For electromagnetic induction, the magnetic field that changes around the electromagnet generates electricity in a nearby conductor, the electrical energy in the air that exists as a magnetic field. For example, the electromagnetic induction current used to charge electric toothbrushes without wires.

In 2006, Marin Soljacic, a professor of physics at the Massachusetts Institute of Technology, wirelessly streamed electricity through a room to light a 60-watt bulb. Soljacic adjusts the electromagnetic field in the coils to give and receive, making them resonate at the same frequency, which is known to be more efficient and safer than Tesla's efforts.

In the near future, many new power systems will emerge, the power transmitted from the source to the equipment used without wires, is said to be quite safe to the user.