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What is the capacitance?

What is a self capacitance?

  • Comprehending the mutual capacitance is easier but it is more difficult to get an intuition of self capacitance. I am confused with the effects of dielectric in the self capacitance.

  • Answer:

    I think dielectrics are the right thing to understand self capacitance. A crude visualization could be this : If you have a charged conductor surrounded by a dielectric medium, the electric field will cause polarization. Since the Earth is also considered a conductor, you could always theoretically consider a plate at infinity at Earth's potential. The important thing to visualize is the dielectric present between the conductor and the Earth. That WILL get polarized, which is where the energy is stored.

Digvijay Singh at Quora Visit the source

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Regarding Self Capacitance and dielectrics, another very practical way to view this is to consider a common copper wire in a PCV insulation sleeve (conductor and dielectric if you like) with no charge on it. When a step change charge is applied to the wire, as charge establishes very freely in the copper but slowly through the PVC, and so, during the transition of charge, a differential appears between the wire and the insulation. Charge will continue to flow once the copper is at the final potential until the field has become established in the insulation, (even if it is a weak field). This is one of several factors that contributes to ‘propagation delay’ in high cables.

Michael

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