Kirchoff’s first law, i.e. Σi = 0 at a junction, deals

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Kirchoff’s first law, i.e. Σi = 0 at a junction, deals with the conservation of

1. charge
2. energy
3. momentum
4. angular momentum

Correct Option: A

We know from the Kirchhoff 's first law that the algebraic sum of the current meeting at any junction in the circuit is zero (i.e. Σi = 0) or the total charge remains constant. Therefore, Kirchhoff's first law at a junction deals with the conservation of charge.