<div dir="ltr">At the same nominal voltage, an incandescent lamp will run<div>equally bright on AC as on DC.</div><div><br></div><div>The AC nominal voltage is the root mean square of the waveform;</div><div>the square root of the mean of the squares </div><div>of many infinitesimally small samples over a complete line cycle.</div><div><br></div><div>squaring and then taking the square root makes it all positive,</div><div>"mean" is like an average over the time of one complete cycle...</div><div>which makes 120 VAC produce the same heating power in a resistor as 120 VDC.</div><div class="gmail_extra"><div class="gmail_quote"><br></div><div class="gmail_quote">HTH</div><div><br></div>-- <br><div class="gmail_signature">...Dan Sheehan<br>Fixer of things that break<br><br></div>
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