Red Seal Electrician Practice
DC circuitsQuestion 296 of 1506

A series circuit has 12 V applied to three resistors of 10 Ω, 20 Ω and 30 Ω. What is the current?

  1. 0.2 A
  2. 0.5 A
  3. 2.2 A
  4. 5 A
Show answer

Correct answer: 0.2 A

RT = 10 + 20 + 30 = 60 Ω. I = 12 V ÷ 60 Ω = 0.2 A.

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

Practice dc circuits

Questions last reviewed: 18 October 2026