.. A redox reaction at two electrodes causes electrons to flow.
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A galvanic cell works by converting chemical energy into electrical energy through redox reactions. As the two half-cells (anode and cathode) are connected by a conducting wire and a salt bridge, electrons flow from the anode to the cathode, causing a potential difference and generating an electric current. The anode undergoes oxidation, releasing electrons, while the cathode undergoes reduction, accepting the electrons.
The voltaic cell
Zn(s)/Zn2+(aq)//Au+(aq)/Au(s)
Two electrodes in electrolyte solutions
An electrolytic cell
Mg(s) Epi-Boii