Difference between WATT & VA

Replies

• 

  Kaustubh Katdare

  mayurpawar85

  Whats meaning of VA & watt??

  Could you share the meaning that you've understood by referring to textbooks? I think you can get a basic idea about what VA and WATT are by referring basic electrical engineering textbook. It'd be really great if you could share what you've understood so that we can help you make your ideas clearer. I think would be a better way of learning, what do you say?
• 

  arunchary

  here is the white paper which will clears the basic confusion k...
• 

  arunchary

  VA (volt-amps) is used on AC equipment that is reactive - like transformers - to show the maximum load on the utility line.
  
  This is done because reactive loads can have current flowing in and out of them - apparent power - but not necessarily use any real power. Nevertheless, the feed has to be sized to the apparent power.
  
  VA and watts are related by the power factor. PF = W/VA
  
  If I and V are perfectly in phase (as for a non-reactive load), the power factor is 1. If I is out of phase with V, then PF becomes less than 1: more apparent power than actual. Link below explains this further.
  
  Small appliances tend to have little reactive behavior so they're simply rated in watts.
  you can look after in below site also..
  Power Factor
• 

  Jeffrey Arulraj

  Watt is the actual power which is consumed by the device
  
  The VA rating is the power which is not consumed by the device but it is linked with the device just as #-Link-Snipped-# said about transformers
• 

  grsalvi

  arunchary

  VA (volt-amps) is used on AC equipment that is reactive - like transformers - to show the maximum load on the utility line.
  
  This is done because reactive loads can have current flowing in and out of them - apparent power - but not necessarily use any real power. Nevertheless, the feed has to be sized to the apparent power.
  
  VA and watts are related by the power factor. PF = W/VA
  
  If I and V are perfectly in phase (as for a non-reactive load), the power factor is 1. If I is out of phase with V, then PF becomes less than 1: more apparent power than actual. Link below explains this further.
  
  Small appliances tend to have little reactive behavior so they're simply rated in watts.
  you can look after in below site also..
  Power Factor

  
  Are sure VA is for power rating of reactive device ?
  Because VAR (Volts ampere reaction) is the specific unit for reactive power.
  VA for active power and WATT is for apparent power.
• 

  naveee

  The_Big_K

  Could you share the meaning that you've understood by referring to textbooks? I think you can get a basic idea about what VA and WATT are by referring basic electrical engineering textbook. It'd be really great if you could share what you've understood so that we can help you make your ideas clearer. I think would be a better way of learning, what do you say?

  sir i hav a doubt in that...in volt ampere we use sine angle (durin calculation)......... but for power factor we use cosine angle .....wat is the difference sir ????
• 

  naveee

  grsalvi

  Are sure VA is for power rating of reactive device ?
  Because VAR (Volts ampere reaction) is the specific unit for reactive power.
  VA for active power and WATT is for apparent power.

  reacting device.......can u plz elaborate it ....
• 

  Jeffrey Arulraj

  naveee

  reacting device.......can u plz elaborate it ....

  Any device having a Capacitor and Inductor will react to the input alternating current and voltage given to the system and so these devices are called reactive devices
• 

  arunchary

  go through pdf which i given as a reference.....