AC to DC, Ripple frequency ?

Thread Starter


Joined Apr 9, 2010
today my technitian said that when we rectify the AC to DC we get more value of voltage , e.g 24ACV after rectification would give more than 24V , is that true ? and why ?


Joined Jun 2, 2008
AC measurement is an RMS value so its peak voltage will be approximately 34V and peak to peak, either side of zero will be 68V. When you full wave rectify the AC you are effectively bringing the negative phase of the AC positive so you end up with a positive series of cycles from zero to 34V peak. This is now DC even if it's still a series of positive half cycles of a sine wave. Introduce a smoothing capacitor to give 34VDC. Hop that makes sense?