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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
 

Diod as full wave rectifier

This type of single phase rectifier uses four individual rectifying diodes connected in a closed loop "bridge" configuration to produce the desired output. The main advantage of this bridge circuit is that it does not require a special centre tapped transformer, thereby reducing its size and cost. The single secondary winding is connected to one side of the diode bridge network and the load to the other side as shown below.

Fig.

The four diodes labelled D1 to D4 are arranged in "series pairs" with only two diodes conducting current during each half cycle. During the positive half cycle of the supply, diodes D1 and D2 conduct in series while diodes D3 and D4 are reverse biased and the current flows through the load as shown below.

The positive half cycle:During the positive half cycle of the supply, diodes D1 and D2 conduct in series while diodes D3 and D4 are reverse biased and the current flows through the load as shown below.

Fig.

The negative half cycle: During the negative half cycle of the supply, diodes D3 and D4 conduct in series, but diodes D1 and D2 switch "OFF" as they are now reverse biased. The current flowing through the load is the same direction as before.

Fig.

In practical circuits the ouput is smoothed by using capacitors of appropriate value.

 

 
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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 :
gr8!!! useful 4 last min revision nd especially 4 lazy lumps!!
 
  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
   
PRIOCCUPIED Said :
THANKS :)
 
  14/10/12 06:53 PM
   
Lakshey Said :
Best site in all of those i founded on internet.
 
  29/08/12 08:07 AM
   
Thiago Said :
This site is great, like the other comments say, its straight forward and to the point! Thx
 
  12/06/12 03:02 AM
   
Aubrey Graham Said :
This website was really useful, it really did help me prepare for my physics IGCSE exam. Thank you so much, your website is structured in short, straight to the point information. One word brilliant.
------------------------------------------------------------------------------------- Admin Replied:

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

 
  22/05/12 03:23 PM
   
Ghost Said :
Thnak you sir, really helpful but some of the diagrams are missing, if u could post those too, it would be helpful... Safwan :)
 
  16/05/12 02:24 PM
   
Irshad Said :
I found this website very useful for revision.
------------------------------------------------------------------------------------- Admin Replied:

Thank you :)

 
  17/04/12 10:37 AM
   
Princess Zoya Said :
Wow this is great !! Thnx alot !! BTW i need explanation in detail for Hydroelectric powerstation !!
------------------------------------------------------------------------------------- Admin Replied:

Thank you :) We will make sure we provide further explaination regarding the topic u've mentioned.

 
  10/04/12 03:36 PM
   
Coop Cooper Said :
This Is Great
------------------------------------------------------------------------------------- Admin Replied:

Thank you :)

 
  28/03/12 10:04 PM
 

 

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