How do they obtain energy? give all,

Cells need a source of energy, they get this energy by breaking down food molecules to release, the stored chemical energy.This process is called 'cellular respiration'. The process is happens in all the cells in our body. Oxygen is used to oxidize food, main oxidized food is sugar(glucose).

PS you're talking about cells right

the electromagnetic energy from the sun arrives in the form of visible and invisible light.