Red Seal Electrician Practice
DC circuitsQuestion 681 of 1506

Which statement is Kirchhoff's Voltage Law?

  1. The total voltage of a loop equals the largest single drop
  2. The voltage across a resistor equals the current times the power
  3. The sum of all currents at a node is the same as the source voltage
  4. The algebraic sum of all voltages around a loop is zero
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Correct answer: The algebraic sum of all voltages around a loop is zero

KVL says that, with polarities counted, the voltages around any closed path add to zero.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 6.2: Kirchhoff’s Voltage Law (KVL)

Practice dc circuits

Questions last reviewed: 18 October 2026