(引自Hampoo论坛)
Z=R+JX =>impedance = Resistance+ Reactance
===================
DC
R:
Only DC f=0 Z=R=电阻=Resistance
R=(L*导电率)/A ; 导电率=(conductivity depend on some materials)
X:
Jx=0
===================
AC
R:
due to skin effect
f越高电流会往表面积集中 ; A 变小-> R变大
X:
AC 中的jx电抗
jx中的"x"=>(xC or xL)
XC=1/JWC =>W=2*PI*f 电抗
XL=JWL =>W=2*PI*f 电抗
=> f VS jx
AC f 越高 => Z=R+jx (jx,Reactance dominate)
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