The concept mentioned below by Duncan is not correct. The DC current that flows into the resistor from the wall socket finds a short circuit to ground in the power transformer center tap in most cases.
All of the power being delivered into the resistor from the wall socket can be determined by taking the AC voltage which is a sine wave and multiplying it by the fundamental frequency of the AC current(also a sine wave). This must be adjusted by multiplication by the cosine of the phase angle between the supply voltage and fundamental current. There can be no power associated with this imaginary DC source since its drive value is 0. This is difficult to understand and has lead to a lot of confusion about the power input. Harmonic currents can not deliver power from the line source either. This is also confusing. This fact leads to interesting measurements such as that the pf can be .5 in the case at hand. Harmonic currents due to distortion show up in the RMS reading of the power meter since they are real. They can be significant if a rectifier or phase modulation triac control is used but they do not contribute to power being delivered from the mains. I hope this clears up some of the confusion that has been rampart. Dave -----Original Message----- From: Alain Sepeda <[email protected]> To: vortex-l <[email protected]> Sent: Mon, May 27, 2013 8:25 am Subject: [Vo]:Re: [Vo]:Re: [Vo]:Re: [Vo]:Re: [Vo]:Torbjörn Hartman describes power measurments Right, that was a know problems with simple rectification and transformers that get magnetized. however you can clearly see it on the waveform. You see the asymetry of shape. impossible to miss. second point is that mixing two voltage, it will kill or trouble other instruments plugged (peak too high), if not using transformer. Rossi would have to know no classic switch power supply will be plugged. this is why the only question if how far Rossi controlled the installation. This is the only important point about fraud : was there enough freedom for testers to make fraud too risky. 2013/5/27 Duncan Cumming <[email protected]> Some people find the difference between current and voltage confusing. What I am saying here is that if you connect a resistor in series with a diode to a wall socket, then the CURRENT drawn is direct even though the VOLTAGE at the socket is alternating. (Rossi does not seem to understand this concept judging by his message that got posted today). So unless you use a DC rated current meter (such as a shunt) you will not sense all of the current, and hence power, drawn from the wall socket.
