Why does the cord of an electric heater NOT glow while the heating element does

Thus, the heating element becomes hot and glows red. On the other hand, the cords are made up of good conductors like copper. They have low resistance, and do not produce much heat when same amount of current is passed through it. Hence, the cord does not glow.

Explanation:

Explanation: Thus, the heating element becomes hot and glows red. On the other hand, the cords are made up of good conductors like copper. They have low resistance and do not produce much heat when the same amount of current is passed through them. Hence, the cord does not glow.

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."