If I'm not mistaken, P = I*I*R, and since V = I*R, then P = I*V.
These formulas only apply for DC circuit ....
AC circuit is not formulated this way....
Oh man...can some electrical gurus step in and help out??
My electrical knowledge return sch 10yr+ ago liao.
By the way, can electrical gurus explain what is phrase angel in electricity?? And also by using a small voltage to chop the sine wave, will the power comsumption be the same before its got chop??