The Sun is generally considered to produce a constant amount of power (although there are small variances in the output energy depending on sunspot cycles) with a surface intensity of , expressed in units of power per unit area.As the Sun's rays spread into space this radiation becomes less and less intense as an inverse square law. The nuclear fusion reactions taking place inside the sun keep on liberating enormous amounts of heat and light energy. The sun’s energy comes from within the sun itself. The enormous pressure in the sun keeps the fusion running for huge amounts of time. This energy constantly emitted by the sun is known as solar energy. The energy coming from the sun to the Earth's surface is called solar energy. A solar cell (also called a photovoltaic cell) transfers the energy of sunlight into electrical energy. As of 2011 , the technology produced less than one tenth of one percent of global energy demand. The sun produces energy through nuclear fusion. Heat energy from the sun causes changing weather patterns that produce wind. Glucose is used by plants for energy and to make other substances like cellulose and starch. The sun is a large ball of hydrogen and helium undergoing constant nuclear fusion, in which atoms of hydrogen combine to form helium and release a large quantity of energy. Cellulose is used in building cell walls. Here are 5 types of energy Earth gets from the Sun. Sunlight is a form of energy called Energy Sources In physics, energy (either described as potential or kinetic energy) is that which is needed to perform work. Wind turbines then convert wind power into electrical energy. Like most stars, the sun is made up mostly of hydrogen and helium atoms in a plasma state. Hydroelectricity is electrical energy produced from moving water, and water flows because heat energy from the sun causes evaporation that keeps water moving through the water cycle. The Sun is the principal source of energy on the Earth’s surface. During photosynthesis, plants trap light energy with their leaves. energy is a renewable energy source. Another wavelength that reaches Earth's surface is responsible for sunburn, skin cancer, and is the reason why we wear cool sunglasses. This heat and light energy is radiated by the sun in all directions in the form of solar energy. Calculating Solar Energy to Surface Energy from Sun to Earth. Plants use the energy of the sun to change water and carbon dioxide into a sugar called glucose. Some talk about heat and light as though they are two different types of energy, but of course they aren’t. It is like a powerhouse which generates and gives out energy in the form of light and heat. -energy that we have here on Earth originates from the sun -sun creates the movement, which creates the wind, where we can get energy from (same works with water) -Some of the sun's energy, though, is reflected from our atmosphere and sent back into space. The heat energy usually reaches earth in the form of light, and many of the sun's rays are in the ultraviolet spectrum. Solar energy is the technology used to harness the sun's energy and make it useable. Most of it is in the form of electromagnetic radiation from the visible wavelengths. It uses the photoelectric effect . Here is a modern building in Lambeth, London. The energy obtained from the sun is called solar energy. The transfer of heat in this way is known as thermal radiation. The other answers have covered most of this, but I’ll put in my 2 cents worth. So much energy is released through the reactions that some of it still can reach to the earth, even though the earth is millions of miles away from the sun. The sun generates energy from a process called nuclear fusion. Plants use a process called photosynthesis to make food. As solar energy is radiated by the sun 's energy and to make other like. 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