RadioBanter - View Single Post - For Roy Lewallen et al: Re Older Post On My db Question

February 14th 06, 07:40 PM posted to rec.radio.amateur.antenna

Reg Edwards wrote:
Watts = Amps times Volts.

Only for DC or in-phase AC/RF.

Volt-Amps = Amps times Volts = SQRT(watts^2 + vars^2)
Watts = Amps times Volts times cos(A) = real power
Vars = Amps times Volts times sin(A) = reactive power
Reference: "Alternating Current Circuits", Kerchner/Corcoran,
3rd edition, (C) 1938, 1943, 1951.
--
73, Cecil http://www.qsl.net/w5dxp