ABSTRACT
Direct current (DC) circuit analysis is the study of circuits with a constant voltage or current source. The most popular example of a DC circuit is a battery and a light bulb. A DC circuit contains an active circuit element capable of generating electric energy. These electric sources convert nonelectric energy to electric energy. Dependent sources establish a voltage or current in a circuit that is based upon the value of a voltage or current elsewhere in the circuit. One use of dependent sources is to model operational amplifiers and transistors. Both the inductor and the capacitor have the ability to store energy. Inductors store energy in the form of current and capacitors store energy in the form of voltage. The energy stored in these elements is released back into the circuit when a DC source is removed. Kirchhoff’s voltage law is based upon the law of conservation of energy.
