Question

A variable frequency AC source is connected to a capacitor. How will the displacement current change with decrease in frequency?

Answer 1

The relation of displacement current change with capacitor is I=C×dV/dt.

• We can also write the relation as V=I×Z or I=V×jWC.
• This shows the frequency and displacement current as they are directly proportional to each other.
• When the frequency increases the displacement current also increases.
• There is also dependency on the phase when it is with respect to source voltage remain constant with frequency.
• This only happens when there is ideal capacitance.