Fuel-cell-powered bus
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The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-Uand SQA exam specifications.
Water can be split into hydrogen and oxygen using electricity. Hydrogen ions (protons) are formed when electrons are removed from hydrogen atoms in an oxidation reaction. In a fuel cell, hydrogen ions, electrons and oxygen combine to form water, causing an electric potential and heating. The electric potential can cause electrons to flow in an external circuit as an electric current that can be used to operate electrical devices, such as electric motors.
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