Meters and troubleshootingQuestion 780 of 1506

A chemical detection cell is used in a portable oxygen analyzer. What does the cell output tell you?

  1. A current proportional to the temperature of the air
  2. A resistance proportional to the wire length
  3. A voltage proportional to the oxygen concentration
  4. A frequency proportional to the air speed
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Correct answer: A voltage proportional to the oxygen concentration

These cells react with the target substance in the air and give a voltage in proportion to its concentration.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 11.4: Special-purpose Batteries

Practice meters and troubleshooting

Questions last reviewed: 18 October 2026