The circuit demonstrates the higher the frequency more current flow. Both circuits are the same and have the same voltage. The circuit that has 1000 HZ has more current flow flow signal than the circuit that has 100 HZ orange signal. 1 / (2 * pi * F * C) is Xc. The higher frequency the lower Xc. Xc is the equivalent resistance for a particular frequency. The higher the frequency the more current flow.
