Conducting plates separated by a dielectric medium, is called Capacitors.

Classification of Capacitors

  1. Fixed Capacitors
  2. Adjustable Capacitors
  3. Variable capacitors

Fixed Capacitors

Paper Capacitors

  1. This type of capacitor is made by two long aluminium foils separated by wax strips and rolled together to take a cylindrical shape.
  2. The working voltage is up to 2000V D.C.
  3. Only fixed paper capacitors are made.
  4. The range of paper capacitor varies from 0.0001 micro farad to 2.0 micro farad.

Mica Capacitors

  1. This type of capacitor is made by two brass or alloy metal plates separated by a thin sheet of mica.
  2. Working voltage – 500 to 2500V
  3. Fixed paper and adjustable capacitors are made.
  4. The range of paper capacitor varies from 2.5 pF to 0.05 pF.

Polyester Capacitors

  1. In this capacitor, polythene is used as dielectric.
  2. Working voltage – upto 400 volts D.C.
  3. Only Fixed paper capacitors are made.
  4. The range of paper capacitor varies from 2.5 pF to 0.05 pF.

Ceramic Capacitors

  1. In this capacitor, ceramic is used as dielectric.
  2. Working voltage – 50 to 1500 volts DC
  3. Only Fixed paper capacitors are made.
  4. The range of paper capacitor varies from 2.5 pF to 0.22 pF.

Electrolytes

  1. In this type of capacitor, electrolytes is used as dielectric.
  2. Working voltage – upto 450 volts
  3. Only Fixed paper capacitors are made.
  4. The range of paper capacitor varies from 1 microF to 2000 micro F.

Oil Dielectric Capacitors

  1. This type of capacitor consists of brass or iron conductor plates separated by oil dielectrics.
  2. Working voltage – upto 25,000 volts
  3. Only Fixed paper capacitors are made.
  4. The range of paper capacitor varies from .001 microF to 0.1 micro F.

Air Dielectric capacitors

  1. In this type of capacitors, air is used as a dielectric between conducting plates.
  2. Working voltage – upto 500 volts.
  3. Only Fixed paper capacitors are made.
  4. The range of paper capacitor varies from 5 pF to 600 pF