Similibus

Hi Can anyone tell me how energy is produced through the Krebs cycle? I get that there is a process of different molecules forming with progressively more and more potential energy in their chemical bonds. What is this energy called - the potential energy in the molecular bonds? And how is it freed and utilised? And what is it called when it is not potential energy anymore, but energy that has been freed and is being utilised? Thanks very much for any answers, Sim