Hi,
there is a good discussion about exactly this subject here -
http://www.control.com/thread/1026228839
In summary VA is used when it is reactive (transformers) and W when it is resistive.
Last Wiki Answer Submitted: June 7, 2009 7:29 am by BlankReg12,265 pts.
If you live outside the United States, by submitting your email address you consent to having your personal data transferred to and processed in the United States.