JOHN MEAD / SCIENCE PHOTO LIBRARY JOHN MEAD / SCIENCE PHOTO LIBRARY
An array of square photovoltaic or solar cells. Because square solar cells use multi-crystal silicon (hence the grainy appearance), they are less efficient than circular cells cut from an ingot of single-crystalline silicon. Circular cells however, can cover only 70% of the area of a solar panel, whereas square cells can cover it completely. Solar cells absorb radiant energy from the sun and convert it into electrical energy.
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