[dcb]

misleading statement in that link
"Since then, researchers have developed several techniques for moving electricity over long distances without wires. Some exist only as theories or prototypes, but others are already in use. If you have an electric toothbrush, for example, you probably take advantage of one method every day."


the toothbrush holder is in very close proximity to the toothbrush when charging, and when they are close it is exactly a transformer.