This gives the meaning of the terms as generally understood in the middle of the 18th century. Robert Hooper's Physician's Vade-Mecum, published in 1812 has been used as a source of terms in the early 19th century; many of the terms mentioned are still in common use.
In either case, the value at x = 0 is defined to be the limiting value sinc(0) = 1. The normalization causes the definite integral of the function over the real numbers to equal 1 (whereas the same integral of the unnormalized sinc function has a value of Ï).
This is not correct unless the voltage is a sine wave.   Answer The peak value of an a.c. voltage or current is the amplitude of that voltage or current waveform-i.e. the maximum value of voltage or current in either the positive or the negative sense. The root-mean-square (rms) value of an a.c. voltage or current.ind it in any book   Comment The average value of a complete sine wave is zero. The figure of 0.639 Vmax or 0.639 Imax is the average over half its wavelength. The rms-value of a sine wave is 0.707 Vmax or 0.707 Imax.