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Question

Which is the best instrument for testing the state of charge of car battery ?
  1. Ammeter
  2. Voltameter
  3. Voltmeter
  4. Hydrometer

A
Voltameter
B
Hydrometer
C
Voltmeter
D
Ammeter
Solution
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A hydrometer is used to test the state of charge of a battery cell. This is performed by measuring the density of the electrolyte, which is accomplished by measuring the specific gravity of the electrolyte. The greater the concentration of sulfuric acid, the more dense the electrolyte becomes.

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