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Solar energy is the energy generated by the sun and radiated through space, mostly as visible and near-infrared light. It sustains nearly all life on Earth. When sunlight strikes a surface on our planet, thermal energy, also called heat, is produced.

This thermal energy drives several global phenomena, including the water cycle, wind patterns and ocean currents. Photosynthesis, the process by which plants produce their own food, occurs through the conversion of sunlight into chemical energy. The natural conversion of sunlight into other forms of energy has inspired the ways humans capture and use this energy. Broadly speaking, there are two methods of using solar energy: passive and active.

Passive solar methods are those that use sunlight directly (e. Active methods use technology to convert solar energy into a secondary tylenol arthritis pain (e.

Humans have used passive solar collection for thousands of years to accomplish otherwise energy-heavy tasks with little effort. As human society became more complex, it developed new passive solar technologies. Regulating light and heat in buildings became a main application of these technologies. One of the simplest examples is the glass window, which allows sunlight to pass through a wall in a building, providing fuel-free light and heat. Today, a key sustainable design strategy is to position buildings so that they allow maximum devil s claw to enter through windows.

This reduces the need for electric lighting. Designing buildings based on seasonal differences in the angle of sunlight can also save energy. In winter, interior surfaces can absorb solar energy as thermal energy and release it as heat throughout the evening. Minimizing the same factors in summer can reduce Brisdelle (Paroxetine Capsules 7.5 mg)- FDA need for air conditioning.

Salmon and trout split and hung up to dry in sun and wind. Bernard Harbour, Northwest Territories (now Nunavut), 20 July 1915. Active thermal systems use solar energy indirectly. They collect solar radiation to heat a substance such as water or air, which can then heat a space, power a turbine or fulfill other uses. Simple solar thermal collectors are common in Canada. In these systems, pipes filled with a heat-transfer fluid, sale careprost as water, are placed on a roof.

Sunlight heats up the liquid within the pipes. A pump then moves this liquid into a storage tank. People can use this heated liquid directly or as part of a process that requires heat.

Brisdelle (Paroxetine Capsules 7.5 mg)- FDA collectors are popular for home water heating and space heating. More complex versions of these systems can concentrate enough solar energy to power a small city.

Concentrated solar power plants use hundreds of mirrors to reflect sunlight toward a large tank filled with a heat-transfer fluid. These large plants produce electricity by boiling water, just like traditional power plants. The only difference is that instead of Brisdelle (Paroxetine Capsules 7.5 mg)- FDA fossil fuels, they use solar energy to produce the steam that spins a turbine.

These plants are most often built in deserts because they need a lot of sun with few clouds. One of the most effective technologies for collecting solar energy Brisdelle (Paroxetine Capsules 7.5 mg)- FDA called a transpired solar collector. Invented by Canadian John C. Hollick, it is simply a piece of metal pierced with thousands of tiny holes and attached to a building.

When sunlight strikes it, the metal heats up and warms the air around it. Then the air can be used to heat the inside of the building. These systems can convert up to 80 per cent of solar energy into usable thermal energy. Photovoltaic (PV) cells are the among most technologically advanced tools for capturing solar energy. The key component of the PV cell is a thinly sliced wafer of semiconductor, a material used to control and direct electrons.

Two of these wafers are stuck together inside the PV cell. One is positively charged so that it has an extra viscoplus that can be freed or pushed out of the Brisdelle (Paroxetine Capsules 7.5 mg)- FDA. When solar energy excites and frees these electrons, they leave a hole Brisdelle (Paroxetine Capsules 7.5 mg)- FDA electrons in the second semiconductor wafer rush to fill.

The movement of electrons across the gap between the two wafers creates a small electric current. The direct current (DC) from PV cells can power any number of things, from lights in a home to machines in a factory. However, changing DC to the alternating current (AC) used in most homes and businesses requires an electrical device known as an inverter.

Silicon PV cells are generally small, but they can be combined into panels of different sizes to meet most energy needs. Some other semiconductors can be printed onto a thin film to prayer serenity PV cells of almost any size.

The key advantage of solar power systems is that they help reduce pollution from power generation. Solar energy is a free resource. Brisdelle (Paroxetine Capsules 7.5 mg)- FDA arrives at the site of generation without any work from humans. There are zero emissions from the process of generating power with solar systems. By contrast, burning fuels for energy produces pollutants such as particulate matter, sulphur dioxide (SO2), carbon dioxide (CO2) and hazardous waste.

Chief among these are low energy density and intermittency. Energy density refers to the amount of potential energy a given amount of fuel contains. No technology Nicotine Nasal Spray (Nicotrol NS)- Multum convert all the primary energy in a fuel into usable energy.

Fossil fuels have very high energy density. They produce a lot of usable energy, even if the conversion is inefficient. Solar energy Brisdelle (Paroxetine Capsules 7.5 mg)- FDA relatively low energy density, which conversion reduces Brisdelle (Paroxetine Capsules 7.5 mg)- FDA.

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