Meters and troubleshootingQuestion 762 of 1506

A hydrometer in a lead-acid cell shows a high electrolyte density. What does this mean?

  1. The cell is fully discharged
  2. The cell has an open circuit
  3. The cell is well charged
  4. The cell has pure water as its electrolyte
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Correct answer: The cell is well charged

Sulfuric acid is denser than water. More charge means stronger acid and denser electrolyte.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 11.1: Electron Activity in Chemical Reactions

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Questions last reviewed: 18 October 2026