Node (circuits)

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In electrical engineering, the term "node" refers to any point on a circuit where the voltage is the same. Without any further knowledge, it is easy to establish how to find nodes by using Ohm's Law: V=IR. When looking at circuit schematics, ideally wires have a resistance of zero (this is not true in real life, but it is a good assumption.) Since it can be assumed that there is no change in the potential across any part of the wire, ALL of the wire in between any components in a circuit is considered part of the same node.

Voltage = Current * Resistance
since voltage is a measure of potential difference the voltage between any two parts of the same wire is:

Vab= (Current) * 0

So at any 2 points on the same wire, the change in potential difference is 0. Therefore, throughout the entire wire between components (the node itself,) the voltage is the same.


Each different color in circuit above is a different node
Each different color in circuit above is a different node

In this circuit schematic the voltage in the green node is the same throughout, likewise, the voltages in the blue node, and the red node are the same throughout.

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