Practice question

When measuring the resistance of an ignition coil, what typical values should you expect for the primary and secondary windings?

  1. Primary winding: very low resistance (0.2 to 1.5 ohms); Secondary winding: high resistance (5,000 to 15,000 ohms).
  2. Primary winding: high resistance (10,000 ohms); Secondary winding: zero resistance (continuity).
  3. Both windings should show infinite resistance (open circuit).
  4. Both windings should have exactly 12.0 ohms to match the battery voltage.

Answer: A — Primary winding: very low resistance (0.2 to 1.5 ohms); Secondary winding: high resistance (5,000 to 15,000 ohms).

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