Question

What is ADP,ATP,iP, NADPH ?

Answer 1

ADP - Adenosine Di-Phosphate
ATP - Adenonsine Tri-Phosphate
iP - Inorganic Phosphate
NADPH- Nicotinamide adenine dinucleotide phosphate

Answer 2

ATP, ADP, and even AMP are all used by cells to power cellular processes. For example, cells have more potassium ions (K+, K is the chemical symbol for potassium, and it's positively charged when it's an ion) in them than they should if the K+ were simply allowed to move from inside to outside the cell under its own free will. What happens is the cell pumps potassium into itself using what's called (surprise, surprise) a potassium pump. But this pump needs energy, so the cell "burns" ATP to power the pump. When ATP is used, the cell strips off one of the phosphate groups (one phosphorus atom bound to three oxygen atoms) in what's called a "reduction reaction." The ATP becomes ADP, because it only has two phosphate groups instead of three. This releases energy, and the pump is powered, forcing potassium to flow into the cell. 

ADP can be stripped down to AMP by other reactions, and even AMP can be used for energy in a pinch. 

Glycolysis is the mechanism by which cells (animal cells use mitochondria, little bean-shaped organelles, and plant cells use chloroplasts) convert A to AMP, then to ADP, then to ATP, using glucose, a sugar, as the power source.