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The generator at the
power station which
produces our AC mains
rotates through 360
degrees to produce one
cycle of the sine wave
form which makes up the
supply.
In the next diagram
there are two sine
waves.
They are out of phase
because they do not
start from zero at the
same time.
To be in phase they must
start at the same time.
The waveform A starts
before B and is LEADING
by 90 degrees.
Waveform B is LAGGING A
by 90 degrees.
The last diagram, known
as a PHASOR DIAGRAM,
shows this in another
way.
The phasors are rotating
anticlockwise as
indicated by the arrowed
circle.
A is leading B by 90
degrees.
The length of the
phasors is determined by
the amplitude of the
voltages A and B.
Since the voltages are
of the same value then
their phasors are of the
same length.
If voltage A was half
the voltage of B then
its phasor would be half
the length of B.
All this has nothing to
do with "set your
phasors on stun".
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