Capacitor is a electronic device used to store electric charges and release them when necessary.Capacitor is constructed by placing a dielectric in between two parallel metallic plates.Capacitor is known in the name of material of dielectric used.
When capacitor is connected to a cell plate connected to positive terminal get positive charge other plate connected to negative acquired negative charge.In this way electrostatic energy is stored in the capacitor
Use of dielectric(insulator) reduce of electric discharge between the plates.it also avoid two plates come into contact .it also increase the capacitance
Capacitance is the ability of capacitor to store electric charge.
Factors affecting capacitance is the distance between metallic plates as distance decreases capacitance increases.,nature of dielectric medium,Area of the plates
Capacitance C=Charge on the positive plate(Q)/Potential difference between the plates(V)
ie C=Q/V
C=eA/d,(e dielectric constant,A area of the plate,V potential difference
Capacitor oppose DC current to pass through it and allow AC current to flow through it.As the frequency of AC increases the resistance decreases.
Unit of capacitance is Farad
Different types of Capacitors
Electrolytic Capacitor
Aluminium Electrolytic capacitor
When a DC potential difference is applied between aluminium plates a aluminium oxide layer is formed it is the dielectric .This capacitor depends on polarity.If polarity changes the metal oxide layer breaks
Tantallum electrolytic capacitor
VACCUM CAPACITOR
PAPER CAPACITOR
CERAMIC CAPACITOR
PLASTIC FILM CAPACITOR
SUPER CAPACITOR/ DOUBLE LAYER CAPACITOR
MICA CAPACITOR
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