ABSTRACT
This chapter explains Gustav Robert Kirchhoff's laws and the circuit theorems. It aims to understand the superposition theorem and apply it to find currents in direct current (d.c.) circuits. The chapter presents the circuit diagram symbols for ideal voltage and current sources. It examines use of Kirchhoff's laws to determine unknown currents and voltages in d.c. circuits. The chapter discusses general d.c. circuit theory. It also provides to Leon Charles Thevenin's theorem and applies a procedure to determine unknown currents in d.c. circuits. It also aims to understand Norton's theorem and apply a procedure to determine unknown currents in d.c. circuits. The chapter addresses use of the equivalence of the Thevenin and Norton equivalent networks. The power transferred from a supply source to a load is at its maximum when the resistance of the load is equal to the internal resistance of the source.
