DC circuitsQuestion 1345 of 1506

Three resistors of 15 Ω, 20 Ω and 100 Ω are connected in series. What is the total resistance?

  1. 120 Ω
  2. 45.0 Ω
  3. 135 Ω
  4. 115 Ω
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Correct answer: 135 Ω

In series the resistances add: 15 + 20 + 100 = 135 Ω.

Source: Computed, 5.2: Simple Series Circuits

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Questions last reviewed: 18 October 2026