^Reactance

Resistance offered by the L or C current in an ac circuit is called reactance. It is of two types

1. Inductive reactance X_L = ωL

2. Capacitive reactance,

Inductive reactance increases with the increase in frequency of ac. An inductor offers no resistance (X_L= 0) to dc, thus acts as short circuit for dc.

Capacitive reactance decreases with the increase in frequency of ac. A capacitor offers infinite resistance (X_C = ∞) to dc, thus doesn’t allow dc to pass through it & acts as open circuit for dc.