In a word: sunlight
It’s not too important to know that solar energy, especially in the sunniest places, is a fairly common source of energy – in fact, it’s one of our most common sources.
The main power sources
Sunlight is the most important, as it penetrates all the way to the ground in the daytime and radiates across the earth. When the sun is behind a hill and the ground isn’t directly sunlight, though, the energy source is still very important, even with a low sun pressure: the ground would absorb the light and it would disappear.
In contrast, it’s important to note that when the sky is dark and we live under a house, which has no direct sunlight through to the ground, it’s the sky that absorbs sunlight. It’s also important that the sunlight that does reach the ground is scattered by the dust above, making it dimmer than the sunlight directly from the sun above. These conditions make the direct sun power more efficient. The sun is also responsible for heating the atmosphere, so the power needed by the atmosphere – mainly the greenhouse effect – is also greatly reduced.
On a more basic level, this is how solar energy is used: you turn a piece of equipment into a light source by drawing power directly from the sun.
Another important thing to take away from this is that, in general, solar energy is more effective than wind power, where the atmosphere makes most of the difference. In fact, it takes around 30% less power to generate electricity when you use the atmosphere to cool the equipment by radiating the sun, as opposed to when you use wind, where it takes around 40% less.
Wind power has the advantage that the atmosphere is used only if it’s actually available, whereas the sun doesn’t have direct sunlight. However, wind is also pretty much inefficient at producing power:
In the middle of the night, without wind
If you take a very hot day, you might be able to generate electricity in this situation, but at the most you might be able to get by using the atmosphere to cool your equipment enough so that the atmosphere can still cool you down. The difference is enormous.
To get more than 3°C (37°F) at the ground, wind also uses the atmosphere: you need very cold air. So, even with an excellent wind, wind power will be far more efficient at generating energy with no direct sunlight than solar (and even
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