alleryStart learning →Which conservation law stands behind each of Kirchhoff's two rules?
ACharge for both the junction and loop rules
BEnergy for the junction rule, charge for the loop
CMomentum for the junction rule, energy for the loop
DCharge for the junction rule, energy for the loop
Answer & Solution
Correct answer: D. Charge for the junction rule, energy for the loop
1. The junction rule counts current in against current out, and current is flowing charge.
2. Charge cannot be created or destroyed at a junction, so the first rule is conservation of charge.
3. The loop rule adds up changes in potential, and potential difference is energy per unit charge.
4. Energy given by the emf must all be handed over to devices in the loop, so the second rule is conservation of energy.
5. Momentum plays no part here, since nothing in a circuit loop is being tracked as a mechanical collision.
_Source: OpenStax College Physics (CC BY 4.0), Ch 21 "Circuits and DC Instruments", section 21.3 Kirchhoff's Rules_
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