# How to Find the Number of Nodes, Branches, Loops and Meshes in a Circuit?

**What is Node, Branch, Loop & Mesh in Electric Circuit?**

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Solving and analyzing electrical circuits and networks, we must know about **Nodes, Branches, Loops, and Meshes** in an electric circuit and network. First, we have to know about Node, Branch, Loop and Mesh and their role in an electrical circuit. We may determine the exact number of branches, nodes, loops, and meshes then.

For this purpose, will find all these terms one by one with the following simple steps.

Consider the following simple electric circuit in fig 1 which contains on **7** components or elements.

**Node**

A point or junction where two or more circuit’s elements (resistor, capacitor, inductor etc) meet is called **Node**. In other words, a point of connection between two or more branches is known as a Node.

**Finding Nodes in Electric Circuits**

After redrawing the above circuit, it becomes as below equivalent circuit. Now you can easily find the total number of Nodes as shown in fig 2 below which has **6 Nodes**.

**Branch**

That part or section of a circuit which locate between two junctions is called the branch. In a branch, one or more elements can be connected and they have two terminals. It may any two terminals single component such as a voltage source, current source, resistor etc.

**Finding Branches in Electric Circuits**

The circuit in Figure 3 has **seven branches**, namely, a “V” voltage source and the sex resistors.

**Loop**

A closed path in a circuit where more than two meshes can occur is known as Loop i.e. there may be many meshes in a loop, but a mesh does not contain on one loop. In simple words, It is a closed path in a circuit.

**Finding Loops in Electric Circuits**

Loops can be found by the following fundamental theorem of circuit and network topology

l = b – n + 1

Therefore, in fig 4, there is **3 number of Loops**.

**Mesh**

A closed loop which contains no other loop within it or a path which does not contain on other paths is called Mesh

**Finding Meshes in Electric circuits**

- In Fig 5, there is
**two****number of meshes.**

**Good to Know:** **A Loop can be Mesh, but Mesh can’t be Loop**.

Overall** circuit with 6 Nodes, 7 Branches, 3 Loops and, 2 Meshes** shown in fig 6.

Related Posts:

- What is an Electric Circuit? Types of Circuits, Network & Parts Of Circuit
- The Main Difference between Linear and Nonlinear Circuit
- Difference between Unilateral and Bi-Lateral Circuits & Elements
- Difference between Active and passive Components

Nodes = Branches – 1 i.e.<br />N = B-1

Or B = N + 1<br />Branches = Nodes + 1

Branch

That the terms junction or point mean one and the same must be emphasized.

Above it says there are 3 loops in the circuit. But if you apply the loop formula L=B-N+1,we get

Loop= 7-6+1= 2 loops ,why??? Am i missing something here?