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Rev. Notes > IGCSE > Electric Circuits
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Electric circuit

Circuit symbols Circuit diagrams
Diode Diode as forward biased and reversed biased Diode as a rectifier
Diode as half wave rectifier Diod as full wave rectifier Transistors
Series circuits Parallel circuits Effective or equivalent resistance in series circuits
Effectice or equivalent resistance in parallel circuits Advantages of connecting lamps in parallel in lighting circuits Potential divider or Potentiometer
Thermistors Light dependent resistor - (L.D.R.) Input transducers
Capacitors Capacitance of the capacitor One Farad
Different types of capacitors Time delay circuits Relay
Rectifier circuits Transistor as switch Light sensitive switch
Temperature operated alarms


Capacitor is a device for storing electric charge. A simple capacitor consists of two metal plates separted by some insulaor like air, paper, mica, oil, etc. A circuit symbol for capacitor is shown below.

When a potential difference is applied between the two plates of a capacitor, the plates acquire certain amount of charge on them. The plate which was at high potential (connected with positive terminal of battery) acquires positive charge and the plate at lower potential (connected with negative terminal of battery) acquires an equal amount of negative charge. the charge remains on them even after the removal of applied potential difference.

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View Comments on this Chapter - Total Comments (12)
O,sidds Said :
THERE SHOULD HAVE BEEN MORE DIAGRAMS!!! but the explanations are good.
  12/01/15 10:30 PM
skyler Said :
you are missing diagrams! but helpful website!
  02/05/13 03:18 AM
Bareera Khizar Said :
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  14/04/13 09:13 PM
Bareera Khizar Said :
gr8!!! useful 4 last min revision nd especially 4 lazy lumps!!
  14/04/13 09:13 PM
  14/10/12 06:53 PM
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  29/08/12 08:07 AM
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  12/06/12 03:02 AM
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------------------------------------------------------------------------------------- Admin Replied:

We are glad it helped you :) keep visiting and thanks for your feedback

  22/05/12 03:23 PM
Ghost Said :
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  16/05/12 02:24 PM
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------------------------------------------------------------------------------------- Admin Replied:

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  17/04/12 10:37 AM
Princess Zoya Said :
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------------------------------------------------------------------------------------- Admin Replied:

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  10/04/12 03:36 PM
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------------------------------------------------------------------------------------- Admin Replied:

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  28/03/12 10:04 PM


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