Pure resistance
, as with DC supplies. Current and voltage are in
phase.
Power dissipated = where
is the angle between voltage and current.
, therefore power dissipated = VI as with D.C.
supplies
Pure inductance
, the inductive reactance.
. Current lags voltage by 90°.
Power dissipated , therefore
—power dissipated is zero.
Pure capacitance
, the capacitive reactance.
. Current leads voltage by 90°.
Power dissipated therefore
— power dissipated is zero.
Remember (Fig. 8.1):
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