Fig. 10.2a Galvanic cell
In Fig. 10.2b, a battery or other voltage source is used to force a current through the cell in the opposite direction from the spontaneous reaction in the short-circuited cell. Reaction (10.1) now proceeds from right to left and the positions of the cathode and anode in the cell are reversed. This electrolytic cell mode of operation is commonly employed in practical applications of aqueous electrochemistry (e.g., to produce H2 and O2 by electrolysis of water).
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Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.