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In the past, kettles were made of metal bins like copper. Kettles were put on a rack or a hook above the fire to become hot. Now, metal kettles are put on the stove or rangetop. Sometimes they are made of ceramic or clay.
Now, some people have electric kettles. These kettles plug into the wall and use electricity to generate heat. They are usually plastic or metal. They heat water faster than kettles on a stove. Kettles are often used to make tea.