How does a kettle turn off?

An electric kettle basically is a kitchenware piece, usually made of durable plastic or stainless steel and are powered by electricity. This allows someone to quickly heat water for hot drinks like tea or coffee. Once the water inside reaches the boiling point (212 degrees Fahrenheit), the kettle automatically deactivates itself to avoid the contents from boiling away and damaging the heating element. The older manual kettles are heated over a flame or electrical element but do no have any wiring. The boiling point is indicated by a whistle activated by the escaping steam, at which point the kettle should be removed from the heat source.