Chapter 22 Circuit theorems

22.1 Kirchhoff's laws

Used on its own, Ohm’s law is insufficient to determine the magnitude of the voltages and currents present in complex circuits. For these circuits we need to make use of two further laws; Kirchhoff’s current law and Kirchhoff’s voltage law.

22.1.1 Kirchhoff's current law

Kirchhoff’s current law states that the algebraic sum of the currents present at a junction (or node) in a circuit is zero as shown in Figure 22.1.

Figure 22.1 Kirchhoff’s current law

Kirchhoff's voltage law

Kirchhoff’s ...

Get Engineering Science now with the O’Reilly learning platform.

O’Reilly members experience live online training, plus books, videos, and digital content from nearly 200 publishers.