The concept behind fuel cell vehicles (FCVs) is:
2022
The concept behind fuel cell vehicles (FCVs) is:
Answer: C. Using hydrogen and oxygen to run cars — ConceptA fuel cell is an electrochemical device that continuously converts the chemical energy of a supplied fuel and oxidant into electrical energy. In a…
- A.
Using solar energy to run cars
- B.
Using rechargeable batteries to run cars
- C.
Using hydrogen and oxygen to run cars
- D.
Using improvised CNG to run cars
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Show answer & explanation
Correct answer: C
Concept
A fuel cell is an electrochemical device that continuously converts the chemical energy of a supplied fuel and oxidant into electrical energy.
In a hydrogen fuel cell, hydrogen is oxidized at the anode and oxygen is reduced at the cathode; the process produces electricity, water, and heat.
Application
A fuel cell vehicle stores hydrogen and takes oxygen from the air. Its fuel-cell stack uses their electrochemical reaction to generate electricity, and that electricity powers the traction motor.
Contrast
Using solar energy describes a solar-electric vehicle, in which photovoltaic panels are the energy-conversion device.
Using rechargeable batteries describes a battery-electric vehicle, in which electrical energy is stored and replenished by charging.
Using hydrogen and oxygen describes the reactants supplied to a hydrogen fuel-cell stack.
Using CNG describes a combustion pathway based mainly on compressed methane-rich gas.
Cross-check
A fuel-cell stack needs a continuing supply of fuel and oxidant, unlike a rechargeable battery that stores energy. The hydrogen-and-oxygen description therefore matches the operating principle.
Result
Therefore, fuel cell vehicles use hydrogen and oxygen to generate the electricity that runs the car.