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Aug22-14, 11:08 PM
Oh,okay. Thanks by the way now I am atleast clear with what rms is.
Now if I want my bulb to glow brighter I should not use pure ac nor pure dc but a combination of both(equally).
Aug23-14, 05:17 AM
Take average over T not T/2. One whole line cycle. If you use T/2 you haven't accounted for the second half cycle where the function has value zero and your mean will be too high.
And i think you implied integrating the function^2 ?
Well done ! Thanks ! We all love to see "the light go on" .
I woke up worried i might've been ambiguous, or wrong...
We only integrate to T/2 because after that the function is no longer a sinewave.
Maybe you're sharp enough to write the equation of a halfwave rectified sine but i'm not.
So we integrate to T/2 accumulating the mean of sin^2 curve for that first half cycle
and realize that mean is spread over twice the period of integration making it half as big
so there's a 1/2 underneath the radical
which puts a √2 into our result
RMS output of a full wave rectified sinewave is Vpeak/√2
but a half wave is Vpeak/2
less by only √2 not half. Root comes after Mean.
So T1 to T/2 are limits of integration
but T1-T2 is the interval over which we average.
You said it exactly right.
Bravo ! And Thanks Again for closing the loop .
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