Final answer:
The heating loop in an electric kettle is placed at the bottom for efficient heat transfer and distribution.
Step-by-step explanation:
The heating loop in an electric kettle is placed at the bottom of the kettle for efficient heat transfer. This placement allows the heat to be evenly distributed throughout the entire kettle, ensuring that the water boils uniformly.
When the heating element at the bottom of the kettle is turned on, it heats up the water in direct contact with it. The hot water then rises due to convection, creating a circulating current. This circulation helps distribute the heat throughout the kettle, heating the remaining water more quickly.
This arrangement also helps prevent overheating of the heating element itself. Placing the heating element at the bottom allows it to be submerged in water, which helps dissipate the heat and prevent damage to the element.