WAEC - Physics (1996 - No. 19)
The heating element in an electric kettle is usually located near the bottom of the kettle because
water is a good conductor of heat
heat can be more quickly radiated to all parts of the water
no heat can be lost to the surroundings
the convectional currents which are set up can carry heat to all parts of the water
the molecules of the heating element can carry heat to all parts of the water.