Figure 35. Input and output pulses for a lowpass,
b. At 10 usec, the applied voltage is equal to 10 volts. Since
there is only a small difference between E and Ec at this time, the
capacitor quickly charges to 10 volts while the current and ER
decrease to zero. Ec then remains at 10 volts during the remainder
of the duration period of the input pulse.