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ALL PHYSICS DOUBTS - POST HERE !!

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haris94:
one question - applies to the same diagram above
if the d.c output is from a bridge rectifier, the negative current is converted to positive and the output on the screen will be like diagram 2.
am i right?

Saladin:
yes, that is true.

holtadit:

--- Quote from: haris94 on April 05, 2010, 09:17:27 pm ---one question - applies to the same diagram above
if the d.c output is from a bridge rectifier, the negative current is converted to positive and the output on the screen will be like diagram 2.
am i right?

--- End quote ---

So your saying if a diode receives an AC input the output will be the second diagram ?

Saladin:
a diode has nothing to do with this.

a diode, simply has the ability to block current, and block 100% of it.

so say u giv an alternating current.

the di-ode will block everything.

which is unlike a recitifier, which will ony block a the alternating current.

haris94:
normally if an a.c supply is given, the diode used (1 diode) allows current to flow only in one direction
this means it will allow the positive current to flow and will block the negative
(an ac supply has both positive and negative current)
since the negative part is blocked, the output will be the the positive bump and the negative which is a straight line (like your first diagram)

a bridge rectifier is different. here u use 4 diodes and the negative current is converted (not blocked) to positive current
and so the output curve will be the positive bumps repeated continuously (like your second diagram)

got it ?

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