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level: Conductors, semiconductors and insulators

Questions and Answers List

level questions: Conductors, semiconductors and insulators

QuestionAnswer
what is a conductora material that allows the flow of electricity through it
what is an insulatora material that does now allow electrons to easily move through it
what is a semi conductormaterials that can act as conductors or insulators under certain conditions
how do individual atoms conductin conductors the outer energy level is not full this allows a degree of movement for the electrons
why don't individual atoms of an insulator conductin an insulator the outer energy level is full and the electrons are not free to move
what happens to the energy levels of atoms when they are brought togetherthe outer energy levels interact with each other to form an energy band
what is the conduction bandthe highest energy band
what is the valence bandthe band below the conduction band
what is a band gapspace between energy bands
describe the energy bands in conductorsvalence and conduction band overlap and are both partially filled valence electrons can move freely through the material
in insulators how full is the valence bandcompletely full of electrons
what is the size of the band gap in insulatorsvery large
why don't insulators conduct electricityat room temperature there is not enough energy to move electrons from the valence band to the conduction band
how full is the valence band in semi conductorscompletely full
what is the size of the band gap in semi conductorsrelatively small
what happens when you increase the temperature of a semi conductorelectrons are given enough energy to jump the band gap to from the valence band to the conduction band, and so the material conducts
explain using band theory why a semiconductor can conduct at room temperaturethe band gap in semi conductors is small some electrons have enough energy to move from the valence band to the conduction band