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Ripple factor 
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#19
Aug2214, 11:08 PM

P: 21

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). 


#20
Aug2314, 05:17 AM

Sci Advisor
PF Gold
P: 3,745

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" . EDIT 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 that's why: 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 T1T2 is the interval over which we average. You said it exactly right. Bravo ! And Thanks Again for closing the loop . 


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