Kirchhoff’s Laws — A/L Physics

How do I practise Kirchhoff’s Laws?

1 question with a worked solution

1. Kirchhoff's Junction Rule (Current Law, ΣI = 0) and Kirchhoff's Loop Rule (Voltage Law, ΣV = 0) are direct consequences of which fundamental physical conservation laws, respectively?
   1. A) Conservation of energy and Conservation of linear momentum
   2. B) Conservation of mass and Conservation of magnetic flux
   3. C) Conservation of electric charge and Conservation of angular momentum
   4. D) Conservation of electric charge and Conservation of energy
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   Correct answer: D) Conservation of electric charge and Conservation of energy

   Kirchhoff's first law (Junction Rule) asserts that charge cannot accumulate at an electrical node, embodying Conservation of Electric Charge. Kirchhoff's second law (Loop Rule) states that the sum of potential differences around any closed circuit loop is zero, embodying Conservation of Energy.

   Show worked solution

   Step 1: Junction Rule: ΣI_in = ΣI_out => Conservation of Charge. Step 2: Loop Rule: ΣΔV = 0 around closed loop => Conservation of Energy. Answer: Conservation of electric charge and Conservation of energy.
   Modelled on: the A/L Physics examination pattern

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Where does Kirchhoff’s Laws fit in the syllabus?

Unit 7.5 · Year 2 · Term 1