effective voltage, “EX9 - Video 2/2”.

" We have two identical circuits, the first supplied by a source of V(t)= 7+8Sin(2t) [Vac] and the second by V(t)= -7+8Sin(2t) [Vac], so the voltage sources are different. We calculate the active power for each circuit, knowing that this results from the RMS values, P=(Veff)²/R. The calculations result in the same RMS Veff values for both circuits, and therefore the same active power. Whether the voltage is +7[Vcc] or -7[Vcc], electrons physically flow in one direction or the opposite, always generating friction and dissipating heat, so the thermal energy is the same. This explains the same active power found in both circuits. The rms voltage (Veff), and therefore the rms current (Ieff), represents neither the mean value of V(t) , nor the dc voltage. At the very least, we can compare the thermal effect generated by an RMS voltage with that generated by a DC voltage. In both cases, we have the same heat release, the same thermal effect. The comparison ends there. In other words, the RMS value shows us what is happening effectively, efficiently and, above all, physically. "