Question

Define inductive reactance and give its units.

Answer 1

The peak value of current I_m is given by I_m = ${\displaystyle \frac{{\text{V}}_{\text{m}}}{{\text{L}}_{\omega }}}$. 

Let us compare this equation with I_m ${\displaystyle \frac{{\text{V}}_{\text{m}}}{\text{R}}}$ from the resistive circuit. The quantity ωL plays the same role as the resistance R in the resistive circuit. This is the resistance offered by the capacitor, called capacitive reactance (X_L). It measured in ohm.

X_L = ωL