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Questions and Answers
What is the cathode of a battery when it is supplying power?
What is the cathode of a battery when it is supplying power?
- The positive terminal (correct)
- The negative terminal
- The terminal marked negative
- Both positive and negative terminals
What delivers the free-energy difference to the external circuit as electrical energy in a battery connected to an external electric load?
What delivers the free-energy difference to the external circuit as electrical energy in a battery connected to an external electric load?
- Electrochemical cells
- Electron source at the negative terminal
- Redox reaction (correct)
- Applied electric current
What happens to the electrode materials in primary (single-use or 'disposable') batteries during discharge?
What happens to the electrode materials in primary (single-use or 'disposable') batteries during discharge?
- They are restored by reverse current
- They remain unchanged
- They convert high-energy reactants to lower-energy products
- They are irreversibly changed (correct)
Which type of battery can be discharged and recharged multiple times?
Which type of battery can be discharged and recharged multiple times?
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What did the term 'battery' historically specifically refer to?
What did the term 'battery' historically specifically refer to?
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Study Notes
Battery Fundamentals
- The anode is the cathode of a battery when it is supplying power.
Energy Conversion
- The chemical energy in the battery delivers the free-energy difference to the external circuit as electrical energy in a battery connected to an external electric load.
Primary Batteries
- During discharge, the electrode materials in primary (single-use or 'disposable') batteries undergo irreversible chemical changes that make them unusable after a single use.
Rechargeable Batteries
- A secondary battery (or rechargeable battery) can be discharged and recharged multiple times.
History of Batteries
- Historically, the term 'battery' specifically referred to a group of electrochemical cells connected together to form a single unit.
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