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