ABSTRACT
The graph shows how much time the wave spends conducting, and what effect this has on the RMS voltage. If the control circuit tells the SCR to begin conducting late in the cycle, a smaller voltage is produced. If conduction begins sooner, a larger voltage is produced. SCRs conduct in one direction only, somewhat like a diode, so in order to make use of the entire sine wave, two inversely mounted SCRs are generally used.
