How does thickness and length of wire affect the heat produced ????
An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. This hinders the current to flow and causes resistance.
The resistance of long wire is greater than the resistance of a short one because electrons collide with more ions. The relationship between resistance and wire length is directly proportional.The resistance of thin wire is greater than the resistance of a thick wire because a thin wire has fewer electrons to carry the current. The relationship between resistance and the area of the cross section of a wire is inversely proportional.