Red Seal Electrician Practice
DC circuitsQuestion 298 of 1506

Three resistors of 10 Ω, 20 Ω and 30 Ω are connected in parallel. How does the total resistance compare to the resistors?

  1. It is 60 Ω, the sum of all three resistors
  2. It is 20 Ω, the middle one of the three
  3. It is lower than 10 Ω, the smallest resistor
  4. It is between 10 Ω and 30 Ω in value
Show answer

Correct answer: It is lower than 10 Ω, the smallest resistor

Each added path lowers the total resistance. The calculated value is about 5.45 Ω.

Source: Troubleshooting Motors and Controls (Dickson-Self), 1.2: Electrical Fundamentals

Practice dc circuits

Questions last reviewed: 18 October 2026