Difference between AC and DC current

Replies

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  Vishal Sharma

  jyothirmaijo

  can i know what is the main difference between ac and dc????

  AC current that is "alternating current" as the name itself says "alternating" which means it has both +ve half cycle and -ve half cycle of current. hence we all it alternating current
  whereas, DC current only consist of +ve half cycle of current!
• 

  sauravgoswami

  Vishal0203

  AC current that is "alternating current" as the name itself says "alternating" which means it has both +ve half cycle and -ve half cycle of current. hence we all it alternating current
  whereas, DC current only consist of +ve half cycle of current!

  To add more AC current are sine wave wereas DC current is a straight line,AC Current has 3-Phases while DC current do not have any phases
• 

  satty lavanya

  ac current means alternating current which has the sinusodial current and dc current that is direct current which has the constant current supply....
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  Vishal Sharma

  satty lavanya

  ac current means alternating current which has the sinusodial current and dc current that is direct current which has the constant current supply....

  i think #-Link-Snipped-# said the same thing above
• 

  Kaustubh Katdare

  In order to understand the basic difference between AC and DC currents, one must go into the roots of how electricity is produced. Also, as noted earlier, it's important to visualise the AC current (in its graphical form) to have clear thoughts on how it differs from DC current.
  
  I'd like to leave you with another question to explore: Why is AC a preferred type for longer transmissions? ( this could very well be your viva question )
• 

  Abhishek Rawal

  The transformers steps up increasing its voltage for longer distance transmission .... while the electric box you find near your lane/society/building consists of step down kit to decrease voltage for local area/residential area transmission.
  
  HVDC can be used for power supply to longer distance but it is not preferred for local area. why ? maybe because in DC supply once you get short its impossible to come out alive .... while in AC due to its property of di/dt it is more convenient.
  
  If any other reason .... elaborate please.
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  Avinash S

  Could I post a fundamental question on this. How would we classify a current output from a sensor like a photodiode in varying light intensity.
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  Jeffrey Arulraj

  AC current has an altering +ve and -ve peak voltage in it the current varies with time ie AC current is a function of time
  
  where as the DC current is not so it has a constant value at any instant of time . the two possible states available in DC current is ON state end OFF state
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  jyothirmaijo

  thank you every one for ur valuble answers.................
• 

  arunchary

  here is the document you can get better understand...
• 

  satty lavanya

  Vishal0203

  i think #-Link-Snipped-# said the same thing above

  ya.i know.but..i thought.... while giving the answer is what in my view.i should post the answer....if another person said the same thong or not
• 

  Jeffrey Arulraj

  Avinash S

  Could I post a fundamental question on this. How would we classify a current output from a sensor like a photodiode in varying light intensity.

  
  it is not AC it is merely a DC having some AC ripples and
  
  any ways the curve get is an exponentially decreasing one and not a sinusoidal one in the case of photo diode and stuff like that
• 

  naveee

  jeffrey samuel

  AC current has an altering +ve and -ve peak voltage in it the current varies with time ie AC current is a function of time
  
  where as the DC current is not so it has a constant value at any instant of time . the two possible states available in DC current is ON state end OFF state

  multivibrator works on AC or DC ( corect my answer .... as u said DC has only ON OFF conditions........ MULTIVIBRATOR should be worked in DC ???? )
• 

  Nishant Patel

  If we concern about wireless Tranmission.. over long-distance ;only a.c. can be used.. d.c. signal can't generate E.M. waves via antenna.(we can't get varying ele. as well as magn. field). so there shouldn't doubt on long dist. commn.
• 

  Jeffrey Arulraj

  Nishant Patel

  If we concern about wireless Tranmission.. over long-distance ;only a.c. can be used.. d.c. signal can't generate E.M. waves via antenna.(we can't get varying ele. as well as magn. field). so there shouldn't doubt on long dist. commn.

  it is not AC signal used for transmission
  
  we use analog signal here instead of digital signal
  
  they are different AC DC ANALOG AND DIGITAL
• 

  Jeffrey Arulraj

  naveee

  multivibrator works on AC or DC ( corect my answer .... as u said DC has only ON OFF conditions........ MULTIVIBRATOR should be worked in DC ???? )

  can you tell what is a multi vibrator that itself tells the answer to your post
• 

  naveee

  jeffrey samuel

  can you tell what is a multi vibrator that itself tells the answer to your post

  a device that produce clock signals for digital circuits 😀
• 

  Sairam_007

  AC current reverses its direction while flowing in a circuit..whereas DC current It flows in one direction in the circuit....
  AC current is the current of magnitude varying with time..in DC the current has a constant magnitude!
  
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  Jeffrey Arulraj

  here the ip is DC supply but the op is digital and not AC
  
  kindly don't confuse AC and digital signal guys
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  sauravgoswami

  I feel everyone should hit wikepedia to understand electricity,we are wayward from the actual question and moving more towards electronics and digital signal.
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  Jeffrey Arulraj

  there is an unnecessary confusion here about ANALOG DIGITAL AC AND DC signal
  
  some are confusing current with signal
• 

  ganesh p

  AC-average value=0
  DC-average value=finite
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  Nishant Patel

  ya..its exactly an analog signal..not an AC.