a) Conductors
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10 Terms
define number density
the number of free electrons per unit volume in a material
state the formula for number density
number density (m-3) = number of free electrons / volume (m3)
state how number density affects conductivity
larger number density → stronger conductivity
state the overall electrical conductivity of an insulator
weak
state the number density of an insulator
close to zero
state the overall electrical conductivity of a semiconductor
moderate
state the number density of a semiconductor
around 1018m-3
state the overall electrical conductivity of a conductor
strong
state the number density of a conductor
around 1028m-3
explain how to increase the conductivity of a conductor
the electrons would have to move faster
by increasing the p.d.
by decreasing the resistance
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