Red Seal Electrician Practice
DC circuitsQuestion 632 of 1506

Three resistors are in series with a supply. An ammeter in the first resistor reads 20 mA. What is the current in the third resistor?

  1. About 7 mA, one third of the total
  2. 60 mA, the sum of the three
  3. 20 mA
  4. It depends on the resistor value
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Correct answer: 20 mA

In a series circuit there is one path, so the current is the same through every component.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 5.2: Simple Series Circuits

Practice dc circuits

Questions last reviewed: 18 October 2026