Electrical Engineering ⇒ Topic : Leakage Resistance of a Capacitor

Maninder
 
Leakage Resistance of a Capacitor The resistance of the dielectric of the capacitor is called leakage resistance. The dielectric in an ideal capacitor is a perfect insulator (i.e., it has infinite resistance) and zero current flows through it when a voltage is applied across its terminals.The dielectric in a real capacitor has a large but finite resistance so a very small current flows between the capacitor plates when a voltage is applied.
figure (a) Fig. (a) shows the equivalent circuit of a real capacitor consisting of an ideal capacitor in parallel with leakage resistance R_{l}. Typical values of leakage resistance may range from about 1 MΩ (considered a very "leaky" capacitor) to greater than 100,000 MΩ. A well designed capacitor has very high leakage resistance (> 10^{4} MΩ) so that very little power is dissipated even when high voltage is applied across it.
 
 
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