9.3 Phasor (5)
Example 4
Transform the following sinusoids to phasors:
i = 6cos(50t – 40o) A
v = –4sin(30t + 50o) V
Solution:
a.  I                  A
b.  Since –sin(A) = cos(A+90o);
     v(t) = 4cos (30t+50o+90o) = 4cos(30t+140o) V
     Transform to phasor => V               V