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Tom Donaly wrote:
Cecil was talking about current, not power. You can't add power the way you can voltage and current. That's absolutely correct. When one adds powers, one must include the interference term which takes care of conservation of energy. The equation is: Ptot = P1 + P2 + SQRT(P1*P2)cos(theta) where theta is the phase angle between V1 (associated with P1) and V2 (associated with P2). The last term is labeled the "interference term" and is absolutely necessary when adding powers. If the interference term is positive, the interference is constructive. If the interference term is negative, the interference is destructive. The best reference on interference and the adding of powers that I have found is Chapter 9 in "Optics", by Hecht. -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |