CAPACITOR Capacitor is an electronic component used to smooth out

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Presentation transcript:

CAPACITOR Capacitor is an electronic component used to smooth out the output current or voltage in a rectifier Capacitor is NOT a semiconductor device Symbols for capacitor

CAPACITOR The direct current produced after rectification is not smooth enough Current/A Time/s By using capacitor in rectifier circuit,the direct current becomes smoother Current/A Time/s

Direct current produced CAPACITOR Current/A AC Source Time/s Current/A AC Source Time/s Direct current produced almost smooth

CAPACITOR Capacitor is charged up when the current flows Source Capacitor is charged up when the current flows through resistor R Current/A Process of charging and discharging occur repeatedly Time/s Capacitor is discharged when there is no current flows through resistor R

CAPACITOR A smooth direct current is produced AC Source Current/A Time/s A smooth direct current is produced

Direct current produced CAPACITOR Current/A AC Source Time/s Without capacitor Current/A AC Source Time/s Direct current produced almost smooth With capacitor

CAPACITOR Capacitor is charged up when the current flows Source Capacitor is charged up when the current flows through resistor R Current/A Process of charging and discharging occur repeatedly Time/s Capacitor is discharged when there is no current flows through resistor R

A smooth direct current is produced CAPACITOR AC Source Current/A Time/s A smooth direct current is produced

PAST YEARS QUESTION A. W,Y,Z B. W,X,Z C. X,W,Y D. X,Y,Z Which bulbs light up continuously ? A. W,Y,Z Capacitor does not allow direct current to flow through it B. W,X,Z C. X,W,Y D. X,Y,Z

PAST YEARS QUESTION A. B. C. D. AC Source The output wave form is smoothen because A. The resistance of the resistor is always increasing and decreasing. B. The charges in the capacitor is always increasing and decreasing. C. The number of electron in the ac source is always increasing and decreasing. D. The current flows through diode is always increasing and decreasing.