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A fuel cell differs from a battery in that a fuel cell

  • A.delivers alternating rather than direct current
  • B.is supplied with reactants from outside
  • C.stores its reactants within the cell
  • D.converts heat rather than chemical energy

Answer: B

It runs as long as fuel and oxidant are fed to it and its electrodes are not consumed, so its capacity is set by the fuel supply rather than by its own size. A battery carries its reactants and stops when they are used.

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