Re: regarding basic doubts


Phil Allison wrote:
<bill.sloman@xxxxxxxx>


1. alternating current and direct current can both be effective in many
applications. In some you need to use one or the other. When it comes
to heating up a resistive load, the heating effect of the sinusodal
alternating current has to be integrated over one full cycle of the
sine wave, and people talk about the root means square voltage averaged
over the full cycle, which turns out to be 2/pi of the peak voltage.


** Huh ??

Care to think that one over - Bill ???


The "230V" 50Hz main voltage has the same heating effect on a resistor
as a 230V DC voltage, but the alternating current cycles between peak
values of +361V and -361V.


** At least it is consistently wrong.

The ratio of peak to rms for a sine wave is 0.7071 or 1/ sq rt 2

The ratio of peak to *average rectified value* is 2/pi.

Thanks Phil. Another senior moment ...

--
Bill Sloman, Nijmegen

.

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