Red Seal Electrician Practice
DC circuitsQuestion 1355 of 1506

Three resistors of 15 Ω, 40 Ω and 60 Ω are connected in parallel. What is the total resistance?

  1. 9.23 Ω
  2. 27.7 Ω
  3. 115 Ω
  4. 38.3 Ω
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Correct answer: 9.23 Ω

1/R = 1/15 + 1/40 + 1/60 = 0.108 S, so R = 9.23 Ω.

Source: Computed, 5.3: Simple Parallel Circuits

Practice dc circuits

Questions last reviewed: 18 October 2026