What is meant by the term 'mean drift velocity' in a conductor?
The average velocity of charge carriers moving through a material due to an electric field.
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What is the formula linking current (I), number density of charge carriers (n), charge of an electron (e), mean drift velocity (v), and cross-sectional area of conductor (A)?
I = current (A)
A = cross sectional area (m2)
n = number density of charge carriers (m-3)
e = charge of electron = 1.6 x 10-19 C
v = mean drift velocity (ms-1)
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Do conductors or insulators have the highest number density of charge carriers?
Conductors
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Do semiconductors or insulators have the highest number density of charge carriers?
Semiconductors
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Give an example of a material with a high number density of charge carriers.
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Give the value of n (number density of charge carriers) for a perfect insulator.
Zero
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