# connecting ac and dc sources in parallel??

Discussion in 'General Electronics Chat' started by rrrchandu, Oct 5, 2012.

1. ### rrrchandu Thread Starter New Member

Aug 9, 2010
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Hello,
If we connect an ac source of 50Hz and a dc source with equal value of voltage what will be the voltage in parallel to them???

2. ### PackratKing Well-Known Member

Jul 13, 2008
850
216
I dunno.......but I think I smell smoke...............

Sumit Aich likes this.
3. ### t06afre AAC Fanatic!

May 11, 2009
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As an aside. Unless otherwise noted the voltage of an AC source is given in RMS voltage. Given it is as sinewave. The peak value of the AC source will be about 1.41 time higher

4. ### ErnieM AAC Fanatic!

Apr 24, 2011
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"Smoke" would be the correct answer in the real world. In the mathematical model world... there simply is no answer. Each source defines the terminal voltages differently. It would be the same if you paralleled two DC sources of different voltages.

It would be the same if you define A=B where A = 50 and B = 25. The statements just don't work.

Is this a general question or something specific you are trying to do?

5. ### wmodavis Well-Known Member

Oct 23, 2010
737
150
Not possible to say because you have not provided enough information to give a definitive answer.

So when you do it be sure to have the Storage O'scope and data logger and video camera hooked up and report back to us so we will be able to share in your discovery.

The video camers is to record the smoke which might it hard to read the scope and datalogger.

6. ### MrChips Moderator

Oct 2, 2009
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Hypothetically, the results would be unknown without more information on the impedances of the sources.

In real life, as everyone else has already said, something is gonna blow.

7. ### rrrchandu Thread Starter New Member

Aug 9, 2010
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thank you,
it is very specific. i am just analyzing the working of transistor amplifier as it will have an ac and a dc source at its terminals of base-emitter. they are having different voltage levels.
what would be the voltage across it??

8. ### kubeek AAC Fanatic!

Sep 20, 2005
4,691
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If you have them in parallel one of them will pass away with lots of smoke.
If you put them in series things start to make more sense.

PackratKing likes this.
9. ### MrChips Moderator

Oct 2, 2009
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Why didn't you say that in the first place?
Use superposition and add the two.

10. ### wmodavis Well-Known Member

Oct 23, 2010
737
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It is such a help when you actually clearly state what it is you want to know rather than some superficial statement oversimplifying to the point that you cannot possibly get meaningful answers that would have you going away frustrated. People here can only answer based on the information YOU the questioner provide.

11. ### crutschow Expert

Mar 14, 2008
13,508
3,385
Post a schematic. Otherwise we'll just continue to play 20 questions.

12. ### rrrchandu Thread Starter New Member

Aug 9, 2010
28
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no yaar
as the transistor is non linear element superposition theorem is not applicable here

Last edited: Oct 7, 2012

Aug 9, 2010
28
0