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Student & Learning Zone - City & Guilds
rms voltage
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<blockquote data-quote="calltronics" data-source="post: 17732" data-attributes="member: 1354"><p>Seriously though....</p><p></p><p>Basically you are taking multiple points on the curve of the voltage sign wave.</p><p></p><p>You are squaring the value.</p><p></p><p>Adding all the values together.</p><p></p><p>Then finding the average of these squares by dividing the total by number of points you have taken.</p><p></p><p>Then and finally take the square root of this average.</p><p></p><p>And lo it should be around 0.707 of the value of the peak of the curve.</p><p></p><p>Try drawing it on a graph paper and doing it.</p><p></p><p>Note the more points you take the more accurate the answer.</p><p></p><p>Lastly and obviously the points on a mains waveform all conform to a sinusoidal waveform. Therefore if you really want to know.</p><p></p><p>A sinusoidal waveform can be represented by a formulae and this formulae can be resolved for RMS values and thus the true calculation for a true sinusoidal waveform simplifies out to be the constant you quoted of 0.707.</p><p></p><p>OK?</p></blockquote><p></p>
[QUOTE="calltronics, post: 17732, member: 1354"] Seriously though.... Basically you are taking multiple points on the curve of the voltage sign wave. You are squaring the value. Adding all the values together. Then finding the average of these squares by dividing the total by number of points you have taken. Then and finally take the square root of this average. And lo it should be around 0.707 of the value of the peak of the curve. Try drawing it on a graph paper and doing it. Note the more points you take the more accurate the answer. Lastly and obviously the points on a mains waveform all conform to a sinusoidal waveform. Therefore if you really want to know. A sinusoidal waveform can be represented by a formulae and this formulae can be resolved for RMS values and thus the true calculation for a true sinusoidal waveform simplifies out to be the constant you quoted of 0.707. OK? [/QUOTE]
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