Why is the handle of a kettle covered with plastic?

Why is the handle of a screw made wide ?

Why is the handle of a pressure cooker made of ebonite?

Martin is constructing an electrical circuit. He notices that all electrical metal wires are covered with plastic. Electrical metal wires are covered with plastic because plastics are good

Martin is constructing an electrical circuit. He notices that all electrical metal wires are covered with plastic. Electrical metal wires are covered because plastics are good

Why the handles of the doors are at maximum distance from the hinges?