####62. The efficiency of a fuel cell is given by [2007]
(a) $\frac{\Delta G}{\Delta S}$
(b) $\frac{\Delta G}{\Delta H}$
(c) $\frac{\Delta S}{\Delta G}$
(d) $\frac{\Delta H}{\Delta G}$
(b) Efficiency of a fuel cell $(\eta)=\frac{\Delta G}{\Delta H}$
$\Delta H$ is the required energy (input) and $\Delta G$ is the useful energy obtained (output).
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