Calculate the conductivity of intrinsic germanium at 300 k
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resistivity=1/（n＊q＊u1+p＊q＊u2）。 here n is electron density，p is hole density，in this situation，n=p=intrinsic carrier concentration.q is unit charge，which is 1.6e-19C. u1 is electron mobility，u2 is hole mobility. Then you can make it. We can use dimension to test and verify it. Also we can simply verify it under low field situation. In this situation, v=u*E.v is carrier velocity,u is carrier mobility,E is electric field.
U=E*L=I*R (ohm's law)
I=J*S, J=n*q*v (1)
R=resistivity*L/S,(2)
after you substitute equation 1 and 2 into ohm's law，you can get the very first equation.
U=E*L=I*R (ohm's law)
I=J*S, J=n*q*v (1)
R=resistivity*L/S,(2)
after you substitute equation 1 and 2 into ohm's law，you can get the very first equation.
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