Red Seal Electrician Practice
DC circuitsQuestion 695 of 1506

Which statement is Kirchhoff's Current Law?

  1. The current in a series circuit is the voltage times the resistance
  2. The algebraic sum of all voltages around a loop is zero
  3. The current leaving a node is always half of the current that enters it
  4. Currents into and out of a node sum to zero
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Correct answer: Currents into and out of a node sum to zero

KCL says that what flows into a junction must flow out of it.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 6.4: Kirchhoff’s Current Law (KCL)

Practice dc circuits

Questions last reviewed: 18 October 2026