Ceramic Capacitor


Ceramic Capacitor- Definition and Meaning

Ceramic capacitors are the common types of capacitors used in most of the electrical instruments as they are more reliable and more cheaper to manufacture. These capacitors consists of ceramic or porcelain discs and are said to be exist in non-polarized form which are used in various types of industries. A Ceramic material is known to be an excellent dielectric because of its poor conductivity and also an efficient supporter for the electrostatic fields.

A fixed value type of capacitor where the ceramic material within the capacitor acts as an dielectric is the Ceramic Capacitor. This capacitor consists of more number of alternating layers with ceramic and also metal layer which acts as an electrode. The composition of this ceramic material in this capacitor tells about the electrical behavior along with its applications.

Ceramic capacitors with multilayer style- MLCC are widely used and produced capacitors applied in the electronic equipments. These capacitors are manufactured coming in different styles and shapes and are used for RFI/EMI suppression systems, and also as feed-through capacitors along with larger dimension systems as a power capacitor in transmitters.

Definition-  A ceramic capacitor is defined as “ A ceramic capacitor is capacitor that uses the ceramic material as an dielectric. The two most common types are ceramic disc capacitors and multi-layered ceramic capacitors.”

Ceramic capacitors are developed in very small sizes and they exhibit very low maximum rated voltage. They are said to be non- polarized, ie. can be safely connected to any AC source. Ceramic capacitors are said to deliver greater frequency responses due to the reason that they exhibit low parasitic effects such as inductance and resistance.

Ceramic Capacitor- Characteristics

Ceramic capacitors exhibit various characteristics as given below-

  • Accurate tolerances and precisions- Ceramic capacitors are mainly used for high stability performances and where in devices with low losses. These devices provide very accurate results and also the capacitance values of these capacitors are stable with respect to the applied voltage, frequency and temperature.
  • Advantages of small size- In cases of packing densities for high components are required, these devices are of great advantage when compared with the other capacitors. For example, a  “0402” multi-layered ceramic capacitor measures about 0.4 mm x 0.2 mm.
  • High power and high voltage- The ceramic capacitors are manufactured in such a way so that it can survive higher voltages and such capacitors are power ceramic capacitors. These capacitors are much larger than the PCBs. They also have specialized terminals used for safer connection of high voltage supply. The Power ceramic capacitors tolerate voltages ranging from 2kV- 100 kV.

Ceramic Capacitor- Applications

The applications of ceramic capacitors includes transmitter stations, induction furnaces, high voltage laser power supplies, power circuit breakers, high density applications, printed circuit boards,, in DC to DC converters, etc. These capacitors are also used as general purpose capacitor and are also used across the brushes of the DC motors in order to minimize the RF noise.

Practise This Question

A cylinder of height 20 m is completely filled with water. The velocity of efflux of water (in m/s) through a small hole on the side wall of the cylinder near its bottom is