Circuit Diagrams
The circuit diagrams in this article follow the usual conventions in electronics; lines represent conductors, filled small circles represent junctions of conductors, open small circles represent terminals for connection to the outside world. In most cases, impedances are represented by rectangles. A practical circuit diagram would use the specific symbols for resistors, inductors, capacitors etc., but topology is not concerned with the type of component in the network so the symbol for a general impedance has been used instead.
The Graph theory section of this article gives an alternative method of representing networks.
Read more about this topic: Topology (electrical Circuits)
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