# Simple alternating current circuits

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):

Questions

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