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Capacitor & Capacitance

The document discusses capacitors and capacitance. It defines a capacitor as a device that stores electrical charge between two parallel plates and defines capacitance as the ability of a capacitor to store energy in the form of electric charge. It describes different types of capacitors including fixed, polarized, and variable capacitors. It also discusses how capacitors work by storing energy electrostatically in an electric field and how capacitors can be connected in series and parallel. Finally, it lists some common applications of capacitors such as in radio tuners, AC circuits, computer circuits, camera flashes, and AC/DC converters.

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Presented by Imran Hossain Chowdhury EEE,44th batch ID:191-141-002 Capacitors & Capacitance 1
Overview  Capacitor  Capacitance  Dielectrics  Construction of Capacitors  Types of Capacitors  Capacitor Working Process  Capacitors in Series & Parallel  Application of Capacitors 2
Capacitor  A capacitors stores an electrical charge between the two plates.  A basic capacitor has two parallel plates separated by a dielectric material.  Capacitors store charge & energy. 3 A capacitor
Capacitance  Capacitance is the storing ability of a capacitor to store energy in form of electric charge.  C=Q/V  The units of capacitance is Farads(F).  Capacitance values are normally smaller, such as nF or pF. 4
Dielectrics  Insulating materials.  The capacitance of a set of charged parallel plates is increased by the insertion of a dielectric materials. 5 Dielectrics in a capacitor
Construction of Capacitors 6 Diagram of a capacitor
Types of Capacitors  Fixed Capacitor  Polarized Capacitor  Variable Capacitor 7 Symbol of 3 types of capacitor
Capacitor Working Process  “A capacitor works by storing energy electro- statically in an electric field” 8 Circuit of parallel capacitor
Capacitors In Series & Parallel  Capacitors in series 9 Capacitors in series
Capacitors In Series & Parallel  Capacitors in parallel 10 Capacitors in parallel
Capacitors In Series & Parallel  Problem: Find the equivalent capacitance of the entire combination.  Solution: 11 (a)
Application Of Capacitors  Radio tuner circuit uses variable capacitor  Blocks DC voltages in AC circuits  Act as switches in computer circuits  Triggers the flash bulb in a camera  Converts AC to DC in a filter circuit 12
End Of Presentation 13