Primary cells

Definition

Primary cells are electrochemical cells that generate electrical energy from spontaneous redox reactions and cannot be recharged. Once the chemical reactants are exhausted, they must be disposed of or recycled.

5 Must Know Facts For Your Next Test

1. Primary cells are designed for single-use; they cannot be recharged.
2. Common examples of primary cells include alkaline batteries and zinc-carbon batteries.
3. They typically have a higher energy density compared to rechargeable batteries.
4. The overall cell reaction in primary cells is irreversible.
5. They are commonly used in low-drain applications like remote controls, flashlights, and clocks.

Review Questions

• What distinguishes primary cells from secondary cells?
• Can primary cells be recharged? Explain why or why not.
• Provide two common examples of primary cells and their typical uses.

Related terms

Secondary Cells: Electrochemical cells that can be recharged by reversing the chemical reactions through an external electrical source.

Redox Reactions: Chemical reactions involving the transfer of electrons between two species, consisting of oxidation and reduction processes.

Alkaline Battery: A type of primary cell where the electrolyte is potassium hydroxide, known for providing a higher energy density compared to zinc-carbon batteries.