I am not a fan of all this smart home stuff but found this article and need to ask someone from a more scientific background to explain it to me..........
http://www.bbc.co.uk/news/business-12292930
The bit in question is this:
My question is, can anyone explain to me the science behind HOW and WHY this system will be more efficient than Gas or Electric?And because the kettle is also powered wirelessly, you can leave it anywhere in the house. The surface senses a kettle has been set down and starts to power it up.
The surface is using magnetic fields to heat directly into the metal inside the product, and only the coil, meaning that you will not burn your hand if you put it next to your thawing meal or boiling kettle.
"It's more efficient than gas and electric," he [Dave Barman] says. "When installed properly, there shouldn't be any cost difference between the traditional method and an induction zone."