Where are the Nodes Located in a Circuit?

[princejan7]

http://postimg.org/image/4kdwwipgv/

Suppose I set up the outer part of the circuit ( ie. everything excluding the R2 resistor)

Now If I want to set up the R2 resistor as shown, I need to know where the nodes b and d are located.

How do I locate node B for example? Is it the negative terminal of the R1 resistor or the positive terminal of the R3 resistor?

 

[gneill]

Nodes are the junctions where components connect. They are not identified with any component in particular. The entire contiguous conducting network associated with the junction comprises the node.

In the following diagram, the contiguous conductors in green comprise node b. The conductors shown in blue comprise node d.