
Instantaneous Power in Periodic Waveforms 6.13
(ii) 70° phase difference translates to 20 × 70/360 ≈ 3.89 ms time interval. The following are the
possibilities:
(a) y(t) started (3.89+ 20n) ms before x(t) and therefore y(t) has a phase advance of (70°+
n360°) with respect to x(t), where n = 0, 1, 2, 3, … . This may also be restated as x(t) has
a phase delay of (70°+ n360°) with respect to y(t).
(b) x(t) started (16.11+ 20n) ms before y(t) and therefore x(t) has a phase advance of (290°+
n360°) with respect to y(t) where n = 1, 2, 3, … . This may be restated as y(t) has a phase
delay of (290°+ n360°) with respect to x(t).
(iii) Now, x