1. 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

2. 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

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

4. 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

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

6. 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

7. 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

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

9. 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

10. 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.