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A: it must apply to AC since there is no phase in DC. Since AC is a complete circle 0-360 degrees the principle if to conduct current at a degree of the circle. And AC has both positive 0 to 180 and negative 180 to 360 polarity it is possible to control output power by conducting current only at certain angle of the circle . The phase angle is to differentiate the conducting current in which quadrant of the circle
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