A capacitor is usually made up of two conductive electrodes in which an insulating material called dielectric separates them as shown in (Fig. 9.6). Applied voltage causes electric charge to be gathered on the surface of the electrodes which are isolated by the dielectric layer, hence, generating an electric field.
If you are wondering which is the negative electrode, the strip indicates which is the negative electrode and the other one is positive. Electrolytic capacitor is mainly used for power supply circuits because of its large capacitance and being able to eliminate small voltage ripple.
The operating temperature can vary from -55°C to +155°C. These capacitors are characterized by their large capacity, large volume, and polarity. They are commonly used for filtering and rectifying in DC circuits. Nominal Capacitance and Allowable Deviation: The nominal capacitance is the capacitance marked on the capacitor.
Ceramic capacitors don’t have polarity and are constructed from two or more ceramic layers as dielectric and metals as the electrodes. From the name implies, ceramic capacitor is made from ceramic material as its dielectric layer. This ceramic acts as an insulator to isolate the pair of electric conductors. Ceramic capacitor is constructed from:
A ceramic capacitor uses a ceramic material as the dielectric. Two types of ceramic capacitors are widely used in modern electronics: multilayer ceramic (MLCC) and ceramic disc, as shown in Fig. 8.5A and B[6,8].
Variable capacitor. Ceramic capacitors don’t have polarity and are constructed from two or more ceramic layers as dielectric and metals as the electrodes. From the name implies, ceramic capacitor is made from ceramic material as its dielectric layer. This ceramic acts as an insulator to isolate the pair of electric conductors.