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define number density
the number of free electrons per volume in a material
state the formula for number density
number density (m^-3) = number of free electrons / volume (m^3)
state how number density affects conductivity
greater number density = stronger conductivity
state the overall electrical conductivity of an insulator
weak electrical conductivity
state the number density of an insulator
close to zero
state the overall conductivity of a semiconductor
moderate electrical conductivity
state the number density of a semiconductor
around 10^18m^-3
state the overall conductivity of a conductor
strong electrical conductivity
state the number density of a conductor
around 10^28m^-3
explain how to increase the conductivity of a conductor
the electrons would have to move faster
by increasing the potential difference
by decreasing the resistance