Plugs and cables could become obsolete after scientists devised a way of recharging electrical devices ranging from laptop computers to lights from a distance.A team from the Massacussetts Institute of Technology made a 60-watt lightbulb glow using electricity sent wirelessly between copper coils set seven feet apart.Scientists have known for years that electricity can be transferred without wires, but had struggled to find a practical and efficient way of making it work.Professor Marin Soljacic used the concept of resonance. Energy can be efficiently transferred between objects that resonate at the same frequency, so he used two copper coils, one transmitting and the other receiving power.

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