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Unformatted text preview: e layer on the surface of the metal and the other ‘plate’ is an electrolytic solution. This process results in high capacitance per volume. These capacitors have polarity. If voltage of the opposite polarity is applied, the oxide layer is attacked and the capacitor may fail at high voltage. Hence, commonly used in DC voltage systems as the bulk capacitor to filter out voltage ripples from the DC supply. These capacitors cannot be used where voltage polarity reverses. On the other hand capacitors built with Mylar, polyester, polyethylene can be used in applications where voltage polarity reverses. Parasitic Effects Practical capacitor can be more accurately modeled with a series resistance Rs, a series inductance Ls (both coming from the leads and plates) and a parallel resistor representing the very small leakage current through the dielectric material. Typically, the series resistance and inductance are very small in magnitude where as the parallel resistance is very large in magnitude. These are...
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- Winter '14