NAD is nicotinamide adenine dinucleotide and FAD is flavin
adenine dinucleotide
NAD is used as coenzyme whereas FAD is considered as a cofactor
used in redox reactions.
FAD can accommodate two hydrogens whereas NAD can accept only
one hydrogen
The reduction of NAD leads to the formation of NADH+ in
glycolysis and Kreb's cycle whereas reduction of FAD leads to the
formation of FADH2 in Kreb's cycle
During electron transport chain, 3 ATPs are produced from a
single molecule of NAD whereas only 1.5-2 ATPs are generated from a
molecule of FAD