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In your body there are many different cells; there is one called the mitocondria, that is the cell that uses energy. In your body there are also things called ribosomes and that is what converts energy into protien.
animal cell:mitochondria plant cell:chloroplast
Your body does not make energy, it extracts it from the food you eat.
The photocell is the part of a solar panel that absorbs light and converts it into electrical energy.
The retina converts light into nerve impulses, which are NOT electrical in nature.
This is part of the process of digestion.
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mouth(food)
photocell
photocell
the appliance, or tool, or whatever it is that uses the power.
Granana of chloroplast