Embed Size (px)
Citation preview
Author : Khairi
CAPACITOR
Capacitor is an electronic component used to smooth out the output current or voltage in a rectifier
Capacitor is NOT a semiconductordevice
Symbols for capacitor
Author : Khairi
CAPACITOR
Current/A
Time/s
The direct current produced after rectification is not smooth enough
By using capacitor in rectifier circuit,the direct current becomes smoother
Current/A
Time/s
Author : Khairi
CAPACITOR
ACSource
ACSource
Current/A
Time/s
Current/A
Time/s
Direct current producedalmost smooth
Author : Khairi
CAPACITOR
ACSource
Current/A
Time/s
Capacitor is charged up when the current flows
through resistor R
Capacitor is dischargedwhen there is no current flows
through resistor R
Process of charging and discharging
occur repeatedly
Author : Khairi
CAPACITOR
ACSource
Current/A
Time/s
A smooth direct current is produced
Author : Khairi
CAPACITOR
ACSource
ACSource
Without capacitor
With capacitor
Time/s
Current/A
Time/s
Current/A
Direct current producedalmost smooth
Author : Khairi
CAPACITOR
ACSource
Current/A
Time/s
Capacitor is charged up when the current flows
through resistor R
Capacitor is dischargedwhen there is no current flows
through resistor R
Process of charging and discharging
occur repeatedly
Author : Khairi
CAPACITOR
ACSource
Current/A
Time/s
A smooth direct current is produced
Author : Khairi
PAST YEARS QUESTIONPAST YEARS QUESTIONPAST YEARS QUESTIONPAST YEARS QUESTION
Which bulbs light up continuously ?
A. W,Y,Z
B. W,X,Z
C. X,W,Y
D. X,Y,Z
Capacitor does not allow direct current to flow through it
Author : Khairi
PAST YEARS QUESTIONPAST YEARS QUESTIONPAST YEARS QUESTIONPAST YEARS QUESTION
ACSource
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.
