Kirchhoff’s Laws include two fundamental principles in electrical circuit analysis:
Kirchhoff’s Current Law (KCL) (Kirchhoff’s First Law or Kirchhoff’s 1st Law) &
Kirchhoff’s Voltage Law (KVL) (Kirchhoff’s Second Law or Kirchhoff’s 2nd Law).
These principles serve as essential tools for evaluating complicated electrical circuits, allowing engineers & researchers to predict & comprehend the behavior of circuits in various configurations. Kirchhoff’s Laws are widely applied in
Electronics engineering,
Electrical engineering, &
Physics for circuit analysis & design.
Kirchhoff’s current law states that the algebraic sum of current entering into a node (or) a loop must be equal to the algebraic sum of current flowing out of it.
A node is a junction, connector, or terminal in a circuit that connects two or more branches by joining or connecting circuit components. A dot represents a node.
In an electrical circuit, the term “Node” typically refers to
the joining or intersecting of two or more components, such as cables, that conduct current. A closed circuit path is also necessary for current to flow through a node, either in or out.
According to the node currents from the above diagram,
The 3 currents entering the node in this case,
I1, I2, and I3 all have positive values, whereas
I4 and I5 have negative values,
the two currents leaving the node.
As a result, the equation can also be rewritten,
Kirchhoff’s Current Law is also called as Kirchhoff’s First Law.
KCL is used to calculate the amount of current passing through each electronic component in a circuit. By adjusting the component’s resistance, we can alter the component’s current according to KCL law.
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