Physics 9702 · AS & A Level · Kirchhoff's laws

Kirchhoff's laws — practice question

A $20\,\text{V}$ d.c. supply is connected to a circuit made up of five resistors $L$, $M$, $N$, $P$ and $Q$. A potential drop of $7\,\text{V}$ occurs across $L$, and there is an additional $4\,\text{V}$ potential drop across $N$. What potential drops are across $M$, $P$ and $Q$?

  • Apotential drop across $M = 9\,\text{V}$, potential drop across $P = 7\,\text{V}$, potential drop across $Q = 13\,\text{V}$
  • Bpotential drop across $M = 13\,\text{V}$, potential drop across $P = 7\,\text{V}$, potential drop across $Q = 13\,\text{V}$
  • Cpotential drop across $M = 13\,\text{V}$, potential drop across $P = 11\,\text{V}$, potential drop across $Q = 9\,\text{V}$
  • Dpotential drop across $M = 17\,\text{V}$, potential drop across $P = 3\,\text{V}$, potential drop across $Q = 17\,\text{V}$

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