Mean Square Value #8211; The mean-square value is the quantity that can be added when summing two signals. e.g. V¯<sup>2</sup> = 1/T∫<sup>T</sup><sub>0</sub> V<sup>2</sup>dt = V<sup>2</sup><sub>0</sub>/2 or I¯<sup>2</sup> = I<sup>2</sup><sub>0</sub>/2