文档介绍：Basic Circuit Theory
Chpter4 Problems
1 If the voltage across a 5F capacitor is 2te −3t V, find the current and the power.
2 In 5s, the voltage across a 40mF capacitor changes from 160V to 220V. Calculating the
average current through the capacitor.
3 The current in a 50pF capacitor is given by the waveform of -20. Sketch a curve of the
power being delivered to the capacitor as a function of time and determine the value of p at t
= µ s.
i ( mA )
10
5
t (µ s )
0 246
− 5
− 10
Fig. 4-20 For prob. 3.
4 A 25 µ F capacitor having no voltage across it at t = 0 is subjected to the single pulse of
current shown in -21. Determine the voltage across, the power entering, and the energy
stored in C at t =: (a) 17ms; (b) 40ms.
i (mA )
20
10
t (µ s )
0 10 20 30
Fig. 4-21 For prob. 4.
2
5 (a) If the capacitor shown in -22 has a capacitance of µ F, let v c = 5 + 3cos 200t V,
and find i c (t). (b) What is the maximum energy stored in the capacitor?
i C
-
+
v
Fig. 4-22 For prob.
6 If the current waveform in -23 is applied to a 20 µ F capacitor, find the voltage v(t)
across the capacitance. Assume the v(0)=0.
i(t )
4
0 1 2 t
Fig. 4-23 For prob. 6.
7 A voltage of 60cos4π t V appears across the terminals of capacitor. Calculate the
current throug