Video Title: Primary vs. Secondary Cells (Batteries) - IB Physics
Channel: IB Physics - Andy Masley
Speakers: Andy Masley
Duration: 00:02:45
Introduction
This video concisely explains the difference between primary and secondary cells (batteries). It covers their definitions, the types of energy involved, and how electron flow differs during charging and discharging.
Key Takeaways
Primary cells are non-rechargeable: Once depleted, the chemical reaction cannot be reversed. Examples include zinc-carbon and other non-rechargeable batteries.
Secondary cells are rechargeable: The chemical reaction that depletes them can be reversed by a charger, restoring their energy. Examples include car batteries, phone batteries, and laptop batteries.
Energy Conversion: In primary cells, chemical energy converts to electrical potential energy, but not vice-versa. Secondary cells convert chemical energy to electrical energy and back again.
Electron Flow: In both types of cells, electrons naturally flow from the negative to the positive terminal. However, in secondary cells, recharging forces electrons in the opposite direction (positive to negative).
Recharging: Recharging a secondary cell involves pushing electrons from the positive to the negative terminal using an external voltage source, reversing the chemical reaction and restoring energy.
