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Going Wireless: How Induction Will Recharge EVs on the Move

More than a century ago, Nikola Tesla studied high-power electromagnetic energy transfer without wires. Which raises the question: Why would Elon Musk, today’s tender of the Tesla flame, be investing more than $100 million in a network of Supercharger stations that still require you to plug in [November 2013]?

The answer is that Nikola’s wireless concept isn’t quite ready for electric-car use. The scientific principle he exploited, inductive coupling, uses the magnetic field surrounding a primary coil to produce an electrical current in an adjoining secondary coil with no physical contact between the two. This works fine in transformers, AC motors, and pads capable of recharging small appliances ranging from toothbrushes to laptops.
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