作者wolala0823 (刚加入．没好友)
看板Electronics
标题[问题]关於电阻的问题
时间Thu Mar 2 16:33:09 2006
Cheap resistor are fabricated by depositing a thin layer of carbon onto
a nonconducting cylindrical substrate. If such a cylinder has radius a
and length d, determine the thickness of the film required for a
resistance R if
a = 1 mm
R = 33 kilo-ohm
σ(conductivity) = 2.9 MS/m
d = 9 mm
谢谢!
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