Primary batteries are designed for one-time use because their electrochemical reactions are generally not practically reversible. Once their active chemicals are depleted, the battery cannot normally be recharged. In contrast, secondary batteries are rechargeable because their chemical reactions can be reversed by applying an external electrical current. Common primary batteries include alkaline and zinc-carbon cells, while rechargeable batteries include lithium-ion and lead-acid batteries.
Primary batteries, unlike secondary batteries, may be ______.
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Question context
This question is part of ⚡ Electrical Engineering within the broader 🛠️ Engineering Essentials subject and appears in the PTS Pakistan Testing Service preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.