The bellow diagram serves as a good summary for what occurs during the Krebs Cycle.
By the end of the Krebs cycle, all the carbons from the initial glucose molecule have been expelled as carbon dioxide. (2 during pyruvate oxidation, and 4 during the krebs cycle)
Energy that has been stored in the electron carrier molecules (NADH and FADH2) can now proceed to the electron transport chain where they can be used to synthesize ATP; the for of usable energy in cells.
Reactants: 2Acetyl-CoA, 6NAD+, 2ADP, 2 phosphate groups, 2FAD
Products: 2CoA, 4carbon dioxide, 6NADH, 6H+, 2FADH2, 2ATP
Location: Mitochondrial matrix
Net ATP: 2