DC circuitsQuestion 778 of 1506

What are the only waste products of a fuel cell that runs on hydrogen and oxygen?

  1. Water and a small amount of heat
  2. Nitrogen oxides and ash
  3. Carbon dioxide and smoke
  4. Hydrogen and sulfuric acid
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Correct answer: Water and a small amount of heat

The cell combines hydrogen with oxygen without ordinary combustion.

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

Practice dc circuits

Questions last reviewed: 18 October 2026