2002-03-27 I meant megaamperes (MA). Is that better?
John ----- Original Message ----- From: "James R. Frysinger" <[EMAIL PROTECTED]> To: "U.S. Metric Association" <[EMAIL PROTECTED]> Cc: "U.S. Metric Association" <[EMAIL PROTECTED]> Sent: Wednesday, 2002-03-27 10:03 Subject: [USMA:19095] Re: watt seconds ?? > "Joseph B. Reid" wrote: > > > > John Kilopascal wrote in USMA 19089: > > > > >. The power formula for DC > > >(P=EI) is modified when used with AC. The factor of cosine of the angle > > >between the current and voltage must be taken in account. If the voltage > > >and current are in phase, then the power is the equal to the voltage times > > >the current as in a DC circuit becaue the difference in angle is zero and > > >the cosine of zero is one. If the voltage and current are pi rad out of > > >phase, then the cosine of pi is zero and the power is zero too, even if we > > >were talking about a megamp time a megavolt > > > > I think he meant pi/2 radians instead of pi radians. > > OK, but what on Earth did he mean by "megamp"? ;-) > > Jim > > -- > Metric Methods(SM) "Don't be late to metricate!" > James R. Frysinger, CAMS http://www.metricmethods.com/ > 10 Captiva Row e-mail: [EMAIL PROTECTED] > Charleston, SC 29407 phone/FAX: 843.225.6789 >
