Name: Overloading of Current
Uploaded: 2019-07-19
Duration: 3 min 47 s
Description: An electric overload occurs when too much current passes through electric wires. The wires heat and can melt, with the risk of starting a fire. Watch this vi...

Question

Explain Kirchhoff’s laws with examples.

Accepted Answer

Kirchhoff's first law (Kirchhoff's Current Law or KCL or Junction Rule) : It states that the sum of the currents flowing towards a junction is equal to the sum of currents leaving the junction. This is in accordance with the conservation of charge.
In the given fig, $I_{1}$ and $I_{2}$ are currents flowing through the respective wires.

Convention: The current flowing towards the junction is taken positive and the current flowing away from the junction is taken as negative.

Hence, $I_{1} + I_{2} = I_{3}$
Therefore, in an electric network, the algebraic sum of currents meeting at a junction is always zero, $\sum_{} I = 0^{}$

Kirchhoff's second rule (Kirchhoff's Voltage Law or KVL Loop rule) : It states that the algebraic sum of all potential drops and emfs along any closed path in a network is zero.

The algebraic sum of the emfs in a loop of a circuit is equal to the algebraic sum of the product of current and resistances in it.
Mathematically, the loop rule may be expressed as :
$\sum_{} E = \sum_{} I R$

Explain Kirchhoff’s laws with examples.

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