The kettle heats up on an open-coil electric hotplate. During the boil, part of the spiral was flooded with water. How has the filament of the non-filled part of the spiral changed?
The open spiral of the tile conducts electricity much better when it is cold than when it is hot. If you cool a part of the heated coil (spill water on it), then by reducing the resistance of the cooled section, the total resistance of the coil will decrease. Because of this, the current in the spiral will increase and the remaining heated part of the spiral will heat up even more – until the remaining part heats up.
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