"Solar cells are the most efficient when they are facing the sun at a certain angle of 90 degrees."
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Solar cells are most efficient when they receive direct sunlight at a perpendicular angle, during sunny days with minimal cloud cover. They are also more efficient in cooler temperatures rather than extremely hot conditions. Additionally, regular cleaning and maintenance of the solar panels can help to maintain their efficiency.
Advances in technology - coupled with the discovery of more efficient materials, make today's solar cells much more efficient than earlier models.
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Plants are the most efficient users of solar energy in the food chain. Through the process of photosynthesis, they convert sunlight into energy that can be consumed by other organisms in the ecosystem.
Plants are the most efficient users of solar energy in a food chain, as they convert sunlight into chemical energy through photosynthesis. This energy is then transferred to herbivores when they consume plants, and subsequently to carnivores when they consume herbivores.
Spacecraft use solar cells to generate electricity because coal combustion requires oxygen, which is limited in space. Solar cells can convert sunlight directly into electricity without the need for oxygen, making them a more practical and reliable choice for spacecraft power generation.