Automotive Electronics Practice Test

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Study for the Automotive Electronics Test. Prepare with engaging flashcards and detailed multiple-choice questions. Each question comes with hints and explanations. Ace your exam with ease!

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What gases are released from a battery when it is being charged?

  1. Oxygen

  2. Hydrogen

  3. Nitrogen and oxygen

  4. Hydrogen and oxygen

The correct answer is: Hydrogen and oxygen

When a battery, particularly a lead-acid battery, is charged, it undergoes a process called electrolysis. During electrolysis, water in the electrolyte solution is broken down into its constituent gases: hydrogen and oxygen. Hydrogen gas is released at the negative terminal (anode) and is often a concern due to its flammability, particularly in environments where there might be a spark. Oxygen gas is produced at the positive terminal (cathode). Therefore, both gases, hydrogen and oxygen, are generated as a result of the charging process. This understanding is crucial for safety in automotive applications, as hydrogen can form explosive mixtures in the presence of air if not ventilated properly. Recognizing the generation of these gases during charging helps in taking necessary precautions in battery maintenance and design.

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