Question

The Kirchhoff's first law $(\sum i=0)$ and second law $(\sum iR=0=\sum E)$, where the symbols have their usual meanings, are respectively based on

• A. conservation of charge and conservation of energy
• B. conservation of charge and conservation of momentum
• C. conservation of energy and conservation of charge
• D. conservation of momentum and conservation of charge

Answer 1

The correct option is A conservation of charge and conservation of energy

According to Kirchhoff's first law, a junction can act neither as a source of charge nor as a sink of charge. This supports the law of conservation of charge.

According to Kirchhoff's second law, the energy per unit charge transferred to the moving charges is equal to the energy per unit charge transferred from them. This supports the law of conservation of energy.