Bulb without connection on

2007/06/11 Roa Zubia, Guillermo - Elhuyar Zientzia

• Ingeniaritza
• Fisika

Wireless technology requires cables. It is always necessary to connect to the electric network, even if it is to charge the battery. But that can change. Scientists have long been trying to transmit the electric current without cables and now a MIT team has taken a big step forward: A 60 watt bulb has been ignited without connection to the electric network.The transmission of wireless electricity requires a field or electric wave. But it is not easy, if an electric field is used, it should be very large and if a wave is used, it should overcome many obstacles. And it is that throughout history different types of waves (which propagate in all directions and unidirectional) have been tested, but it is always a problem of interference. The electrical resonance has been produced in two copper coils, one connected to the electric grid and one induced by the current. Intermediate obstacles do not affect resonance so they have not had problems igniting a bulb connected to the second coil. Finally they have generated electricity two meters from the network. You may someday be able to charge batteries with wireless technology.Photo: Science of science