Physics 9702 · AS & A Level · Physical quantities

Physical quantities — practice question

The diagram illustrates the currents in part of an electric circuit. The resistors are identical. Which equation is incorrect?

  • A$I_1 = I_2 + I_4 + I_5$
  • B$I_2 = I_1 - I_3$
  • C$I_2 = I_3 + I_4 + I_5$
  • D$I_4 = I_3 - I_5$

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