Where are the Nodes Located in a Circuit?

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In a circuit, nodes are defined as junctions where components connect, and they are not tied to specific components. To locate node B, one must identify the junction of the conductors, which includes the negative terminal of the R1 resistor and the positive terminal of the R3 resistor. The diagram illustrates that the green conductors represent node B, while the blue conductors represent node D. Understanding the configuration of these conductors is essential for correctly setting up the circuit. Proper identification of nodes is crucial for circuit analysis and design.
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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?
 
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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.

attachment.php?attachmentid=66113&stc=1&d=1390964051.gif
 

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