INTRODUCTION:
The power
factor is a very important quantity. Its importance
comes from the economic impact it has on industrial users of large amounts
of power. The
power factor (pf)
is defined as the ratio of the average
power to the apparent
power.
Therefore, In general:
EXAMPLE 1:
Notes:

The
previous example clearly indicates the economic impact of the
load's power factor. A low power
factor at the load means that the utility
generators must be capable of carrying more current at a constant
voltage, and they must also supply for higher
line losses than would be required if the
load's power factor were high.

The power factor
is the cosine of the phase difference
between voltage and current. It is also the cosine
of the loadimpedance angle.

The apparent
power (in VA)
is the product of the rms values of voltage and current.

Leading
power factor means that current leads the
voltage and lagging power factor
means current lagging the voltage.






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