Podcast
Questions and Answers
Which part of a cell does the current flow from?
Which part of a cell does the current flow from?
- Electrolyte to electrodes
- Negative terminal to positive terminal
- Positive terminal to negative terminal (correct)
- Base of the cell to cap projecting out
What happens when a cell gets discharged?
What happens when a cell gets discharged?
- It stops giving current and becomes useless (correct)
- It starts giving more current
- It becomes a secondary cell
- It changes its electrode material
What is the main difference between primary cells and secondary cells?
What is the main difference between primary cells and secondary cells?
- Primary cells have only one electrode, secondary cells have two electrodes
- Primary cells have more capacity, secondary cells have less capacity
- Primary cells provide alternating current, secondary cells provide direct current
- Primary cells can't be recharged, secondary cells can be recharged (correct)
How is direct current (d.c.) defined?
How is direct current (d.c.) defined?
What happens in a primary cell after all the chemical energy has been converted into electrical energy?
What happens in a primary cell after all the chemical energy has been converted into electrical energy?
What do the conducting rods in a cell called electrodes do?
What do the conducting rods in a cell called electrodes do?
What role does the electrolyte play in a cell?
What role does the electrolyte play in a cell?
Why are primary cells considered 'use and throw' type of cells?
Why are primary cells considered 'use and throw' type of cells?
In a dry cell, what does the zinc case act as?
In a dry cell, what does the zinc case act as?
What kind of current does a dry cell provide?
What kind of current does a dry cell provide?
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Study Notes
- Direct current (d.c.) flows from the positive terminal of a cell to its negative terminal through a bulb, lighting it up.
- A cell provides direct current of constant magnitude flowing in one direction until it gets discharged and becomes useless.
- A dry cell consists of conducting rods (electrodes) immersed in an electrolyte, with the zinc case acting as the negative terminal and a cap projecting as the positive terminal.
- Cells are classified as primary cells (irreversible chemical reaction, disposable after use) and secondary cells or accumulators (rechargeable).
- Primary cells are discarded after use when all the chemical energy is converted into electrical energy.
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