A device that converts energy of combustion of fuels P like hydrogen and methane, directly into ...

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A device that converts energy of combustion of fuels
P like hydrogen and methane, directly into electrical
\( \mathrm{W} \) energy is known as :-
(1) Electrolytic cell
(2) Dynamo
(3) \( \mathrm{Ni}-\mathrm{Cd} \) cell
(4) Fuel Cell
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