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Match each of Kirchhoff's rules to what it conserves

Exercise and reference answers

Matching pairs
  1. Left
    Junction rule
    Right
    current in equals current out
  2. Left
    Loop rule
    Right
    potential changes around a closed loop sum to zero
  3. Left
    Wheatstone bridge balance
    Right
    R₁/R₂ = R₃/R₄ at the null point
  4. Left
    Internal resistance r
    Right
    why terminal voltage is below the emf

Explanation

One rule is conservation of charge at a junction, the other conservation of energy around a loop. Source: syllabus Physics Part I, Ch 3 Current Electricity.
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