
112
3 SINGLE ELEMENT CIRCUITS
to 220 V. If the PC takes a constant current of 0.5 A from the
DC output while it is functioning, find out how long it will
continue running after the AC mains goes off.
24. A 5 mF capacitor undergoes a change in its voltage by 25 V
in 10 ms. What is the average value during that interval of the
current source output used to charge this capacitor?
25. A symmetric triangular current waveform with a peak-to-peak
value of 20 mA and frequency 10 kHz is applied to a capacitor
from 0 s onwards. The capacitor was carrying an initial voltage
of 10 V. The capacitor voltage is found to vary within 5%
of its initial voltage subsequently ...