Answer:
There are 6 cells.
Advantages of fuel cell:
(i) Pollution free working: There is no harmful product formed in fuel cell. Hence they do not cause pollution problems.
(ii) High efficiency: The efficiency of fuel cell is approximately 70 - 75% which is much higher than the conventional cells.
(iii) Continuous source of energy: Energy can be obtained from the fuel cell continuously so long as the supply of fuel is maintained. The H2/O2 cell has been used for generating electrical power in the Apollo space programmes.
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