Question detail
Explain how a fuel cell generates electricity from hydrogen and oxygen.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Chemical cells and fuel cells (chemistry only)
Question
Explain how a fuel cell generates electricity from hydrogen and oxygen.
Answer
A fuel cell generates electricity by oxidizing hydrogen at the anode, producing protons and electrons. The electrons flow through an external circuit, creating an electric current, while the protons move through the electrolyte to the cathode, where they react with oxygen to form water.
Explanation
This question assesses the ability to explain the process of electricity generation in a fuel cell. A strong answer outlines the roles of the anode, cathode, and electrolyte, demonstrating a clear understanding of the electrochemical reactions involved.
Common mistake
Misconception about the source of voltage
Students think the voltage in a fuel cell comes from the external fuel supply rather than the electrochemical reaction at the electrodes
Explain that the potential difference is produced by the spontaneous redox reactions at the anode and cathode, with the fuel (e.g. H₂) being oxidised and oxygen reduced, creating a chemical potential that drives electrons through the external circuit
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