21.4 Cells and Batteries
Rechargable and non-rechargeable cells
- Batteries are electrochemical cells used as portable sources of electricity
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- Primary cells cannot be recharged and are discarded once the supply of electric current decreases. This happens when the concentration of reactants becomes too low.
- Secondary cells can be recharged over and over This involves converting the products back to the reactants produced when delivering the current by electric current.
Dry cells
Lead-acid accumulator
Hydrogen-oxygen fuel cells
Electric cars