Circuit Node is a Point of Connection Between two or more Elements in electrical and electronics engineering. Three or more points at circuit node is also called a junction. In short, A Circuit Node is a junction point in a circuit board.
A Circuit node is usually indicated by a dot (.) in a circuit Diagram Basically in electrical network theory.
In Circuit Diagrams, connections are ideal wires with zero resistance, so a node may consist of the entire section of wire between elements, not just a single point.
According to Ohm's law. V = IR, the voltage across any two points of a node with minor resistance is V= IR =I .0=0
A Close Path in the circuit can be Called as a Loop.
A loop is a closed path formed by starting at a node, passing through a set of nodes, and returning to the starting node without passing through any Intermediate node more than once, a loop can pass through one loop of circuit. There are three loops in a picture.Gustav Robert Kirchhoff was a German physicist who gave laws to find voltage and current at any point in closed circuit. These laws are known as Kirchhoff's current law (KCL) and Kirchhoff's Voltage Law or (KVL).