Direct current (DC) circuit analysis deals with constant currents and
voltages, while alternating current (AC) circuit analysis deals with
time-varying voltage and current signals whose time average values are
zero.
Circuits with time-average values of non-zero are also important and
will be mentioned briefly in the section on filters.
The DC circuit components considered in this course are the constant
voltage source, constant current source, and resistor.
Electronics also deals with charge Q, electric 
and magnetic 
fields, as well as, potential V.
We will not be concerned with a detailed description of these quantities
but will use approximation methods when dealing with them.
Hence electronics can be considered as a more practical approach to
these subjects.
For the details look at your classical physics and quantum mechanics
courses.
Narippawaj Ngernvijit