In this chapter we take a look at circuits with
dynamic elements. Capacitors and inductors
are dynamic because they store energy, and it takes
time to change energy. Currents and voltages will
be time varying waveforms, which may be
transient (decay away, e.g. e-t), or steady state
(persist in time, e.g. 
).
An audio signal is a practical example of a time varying
waveform.