The efficiency of a fuel cell is given by

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(B) The efficiency of a fuel cell $(\phi)$ is defined as the ratio of the useful work done (Gibbs free energy change,$\Delta G$) to the total heat ene

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$\Delta G/\Delta H$

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(B) The efficiency of a fuel cell $(\phi)$ is defined as the ratio of the useful work done (Gibbs free energy change,$\Delta G$) to the total heat energy available from the combustion of the fuel (Enthalpy change,$\Delta H$).Efficiency $(\phi) = \frac{\Delta G}{\Delta H} 	imes 100$.Ideally,fuel cells are expected to have an efficiency of $100 \%$.

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