Cathode
Definition
The cathode is the electrode where reduction occurs in an electrochemical cell, drawing positive ions from the electrolyte. It serves as the source of electrons in a direct-current circuit.
5 Must Know Facts For Your Next Test
- In a galvanic cell, the cathode is positively charged.
- In an electrolytic cell, the cathode is negatively charged.
- Electrons flow towards the cathode in both types of electrochemical cells.
- Reduction reactions at the cathode involve gain of electrons.
- Cathodes are critical components in devices such as batteries and diodes.
Review Questions
- What role does the cathode play in an electrochemical cell?
- How does the charge of a cathode differ between galvanic and electrolytic cells?
- Why are reduction reactions significant at the cathode?
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Related terms
Anode: The electrode where oxidation occurs, releasing electrons into the external circuit.
Electrolyte: A substance containing free ions that make it electrically conductive, used in electrochemical cells.
Electromotive Force (EMF): $EMF$ denotes the voltage generated by a source like a battery or generator, driving current through a circuit.
