ACTIVE, REACTIVE AND APPARENT POWER
POWER FACTOR
If j is the phase angle between a current
and the voltage causing it, then cos j is the power
factor. This, when multiplied by the
product of the rms volts and amperes, gives the active power (P) in
watts:
SWITCHING ON - ASYMMETRY
If an a.c. circuit is switched on at the worst possible
instant so that the current is initially 100% asymmetrical, the first current
peak may reach approximately 2.55 times the symmetrical rms value of the
current to which it eventually settles.
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