Electric Circuits and Networks, Ist Edition by Pearson

Phasors

Phasor is a complex

number that gives the

amplitude of the

complex exponential

function and the phase

of the complex

exponential function

with the time-variation

of the function

understood as e

j

ω

t

. It

can be used as a

representation for a

sinusoidal function.

The steps involved

in forward and inverse

phasor transformation

are easy and can be

done mentally with a

little practice.

For instance, if

X  1  j1, then the

magnitude is √2 and

the angle is 45° and the

time-domain waveform

is √2 cos(

ω

t  45°), if we

started with a cosine

and it is √2 sin(

ω

t  45°),

if we started with a sine.

Of course, we need to

know the value of

ω

in

addition to X.

The phasor

representation ...