Kirchhoff's first rule (junction rule) at an electrical node is a consequence of which conservation law?
Answer and explanation
Correct answer: C. Conservation of electric charge
- Step 1: Kirchhoff's junction rule states that the algebraic sum of currents meeting at a junction is zero: .
- Step 2: Because current is rate of flow of charge and charge cannot accumulate at an ideal point junction, it embodies conservation of electric charge.
Answer
Conservation of electric charge.
Why not the others: Conservation of energy underlies Kirchhoff's loop rule; conservation of momentum applies to mechanical collisions; and angular momentum applies to rotational systems.
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