## Nodes

A **node** is a place where two or more **elements** are connected.

An **essential node** is a node where three or more **elements** are *connected*.

## Kirchhoff’s Current Law

The algebraic (*signed*) sum of all the currents at any node in a circuit **equals to zero**. **Simply put, the charge does not build up at a node**.

## Closed Loops

A closed loop is defined in this way:

Starting at an arbitrarily selected node, trace a closed path in a circuit and return to the original node without passing through any intermediate node more than once. The loops, a, b, c, and d are partial of the closed loops in the circuit.

Therefore, a **mesh** is a closed loop that does not include any other closed loops. The loops a, b, and c are all meshes.

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