Answer:

An electric kettle, common in Canada but not in the U.S. works by having a double bottom. An electric heating element is contained in between the inner metal container and outer bottom of the appliance. Water never touches the actual element and a thermal cut off switch turns the element off when the water boils.

Contributor: Jadeacres
First answer by Jadeacres. Last edit by Jadeacres. Contributor trust: 3107 [recommend contributor recommended]. Question popularity: 3 [recommend question].