Money VS Instand energy of cell

In order to let us understand and also remember Krebs Cycle, Mr Mano compared it with Money...

Mr Mano: u wont give the person a car when u want to buy the curry puff

wat he tried to mean is NADH, NAD+, FAD, FADH2 is like ATM card, which we cant use them to buy few cent food and things, coz the sellers want is the cash... AS like our cells, need instant energy-ATP.
So,
NADH, NAD+, FAD, FADH2= ATM card (contain energy)
Cells= Seller(no ATP(money) no talk, like Davin said)
Electron Transport Chain/ Mitochodria= ATM machine( to convert NADH and the others to ATP, so that the cell can use it)

Funny, right? I juz wish can learn more from him... I studied that chapter like hell before he taught us that....sigh...

P/s: I feel a bit dissapointed getting my maths 1 marks... I should get higher for that...(am i expecting too high for myself?)