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Question regarding conduction current 
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#1
Jan2814, 12:53 PM

P: 5

Assume a voltage source connected to a capacitor which filled with a dielectric material having non zero conductivity, then,
displacement current=conduction current of the wire=CdV/dt while conduction current density of the dielectric=σE=σV/d But considering dc source, displacement current=conduction current of the wire=0, while conduction current density of the dielectric=σV/d and not equals to zero Why there will be a contradiction? 


#2
Jan2814, 04:17 PM

Mentor
P: 40,639

The DC leakage current is continuous through the wire and the dielectric. If there is leakage current in the capacitor, it has to be supplied by the wire. 


#3
Jan2914, 04:10 AM

P: 5

How about at other frequency? Is the actual conduction current inside the wire equals to CdV/dt+∫σEdS(σ is the conductivity of the dielectric) but not just CdV/dt? 


#4
Jan2914, 10:24 AM

HW Helper
Thanks
P: 5,131

Question regarding conduction current
A practical capacitor can be modelled as an ideal capacitor with two resistances, one in series and the other in parallel.



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