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renewable energy systemsComprehensive Analysis
Renewable energy is energy derived from resources that are regenerative or for all practical purposes cannot be depleted.[1] Renewable energy sources contribute approximately 29.3% of human energy use worldwide. The prime source of renewable energy is solar radiation, i.e. sunlight. The Earth-Atmosphere system supports approximately 5.4 x 1024 joules per year in the solar radiation cycle (Sorensen, 2004). Mankind's traditional uses of wind, water, and solar power are widespread in developed and developing countries; but the mass production of electricity using renewable energy sources has become more com..." 2) "Energy" -- As to renewable energy systemsen·er·gyPronunciation: 'e-n&r-jE Function: noun Inflected Form(s): plural -gies Etymology: Late Latin energia, from Greek energeia activity, from energos active, from en in + ergon work -- more at WORK 1 a : dynamic quality <narrative energy> b : the capacity of acting or being active <intellectual energy> c : a usually positive spiritual force <the energy flowing through all people> 2 : vigorous exertion of power : EFFORT <investing time and energy> 3 : a fundamental entity of nature that is transferred between parts of a system in the production of physical change within the system and usually regarded as the capacity for doing work 4 : usable power (as heat or electricity); also : the resources for producing such power synonym see POWER Pronunciation Symbols | Energy Portal |
Energy is a fundamental concept in physics that is often defined as the capacity to do mechanical work — a definition that is contested by many physicists (see below). The concept of energy has applications throughout the natural sciences.
Energy is subject to a strict local conservation law. That means energy cannot be created or destroyed. The only way the energy content of a given region can change is by the flow of energy to or from adjacent regions. There is also a global law of energy conservation, which says that the total energy of the universe cannot change. The global law is a corollary of the local law (and not vice versa).[1] [2] Conservation of energy is related to a symmetry of the laws of physics, namely invariance with respect to a shift in time, via Noether's theorem.
In classical physics (pre-20th-century), energy was considered a scalar quantity, having no direction in space. In special relativity energy is also a scalar and is one component of more general quantity - [energy, momentum] 4-vector (so energy is associated with the timelike direction).[3] To say the same thing another way, energy is invariant with respect to spacelike rotations, but not invariant with respect to boosts.
The total energy of a system can be subdivided and classified in many ways. For example, it is sometimes convenient to distinguish kinetic energy from potential energy. It may also be convenient to distinguish gravitational energy, electrical energy, thermal energy, et cetera. These classifications overlap; for instance thermal energy is usually partly kinetic and partly potential energy.
Lightning is a highly visible form of energy transfer.
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