Electronics - Diodes and Applications - Discussion

Discussion Forum : Diodes and Applications - General Questions (Q.No. 5)
The dc current through each diode in a bridge rectifier equals:
the load current
half the dc load current
twice the dc load current
one-fourth the dc load current
Answer: Option
No answer description is available. Let's discuss.
16 comments Page 1 of 2.

Abhinav said:   9 years ago
Someone please explain.

Half the time current is flowing from one set of 2 diodes and the other two for the next half. So basically the current is available only for half time period for any diode. While current is available for whole time at load. In this manner isn't each diode carrying half of load DC current?

Balwinder singh said:   1 decade ago
If we use 1, 2, 3, 4 diodes, when +ve cycle of ac is appeared across diode 1, then it will conduct and diode 2 will block full ac current then how will the diode 3 will get +ve cycle to conduct because full ac current is blocked by diode 2 which is connected in between diode 3 and diode 1 ?

Shekhar said:   9 years ago
Dear, here input given to the diode is dc (not ac) that's why through the whole time period a pair of diode is forward biases and others in reverse biases. So current through pair of diode which is in forward biases is equal to load and others have zero.

Subash chandra pakhrin said:   9 years ago
In series configuration current is same, so during the positive half cycle of sine wave diode d1 and d3 will conduct through the load resister, so current will be same same thing commensurate for the the negative half cycle of the sine wave.

Shreedhar said:   1 decade ago
First 2 diodes area connected in series and another 2 are also. But these 2 groups are connected in parallel. And the values of these diodes are selected such that the circuit should be balanced. Therefore load current is equal.

Ambrish Pandey said:   1 decade ago
All diodes are connected in series and in + forward bias diode is on and in - reverse bias diode is on. So in all cases the diode is in farword bias and it will open so it will equal to the load current.

Ashraful islam said:   10 years ago
When d1 and d3 forward bias, this time full current flow between this diode and reverse bias this time full current flow between d2 and d4.

Shubham said:   5 years ago
AC - alternating current, its polarity will change with cycle (+ or -).

DC - Direct Current fixed.

PRADHEEP H N said:   1 decade ago
All diodes are connected in series with load so; in branch the current is same. ANS (A).

Ajay said:   1 decade ago
Those are connected in series thats why the same resistance available in all diodes.

Post your comments here:

Your comments will be displayed after verification.