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# Energy sources

الكلية كلية الهندسة/المسيب     القسم هندسة الطاقة     المرحلة 2
أستاذ المادة واثق ناصر حسين الشمري       01/05/2017 17:36:29
Energy source
References
1-Steam plant operation by Everett B. Woodruf et al
2-HANDBOOK OF ENERGY ENGINEERING by Albert Thumann et al
3- RENEWABLE ENERGY A First Course by Robert Ehrlich
4-Energy source by B. Viswanathan 2006.

1st lecture
Energy is the property that must be transferred to an object in order to perform work on, or to heat, the object. Energy is a conserved quantity; the law of conservation of energy states that energy can be converted in form, but not treated or destroyed. The SI unit of energy is the joule, which is the energy transferred to an object by the work of moving it a distance of 1 metre against a force of 1 newton.
WHAT ARE THE UNITS OF ENERGY?
The fact that energy exists in many forms is part of the reason why there are so many different units for this quantity—for example, calories and British thermal units (BTUs) are typically used for heat; Joules, ergs, and foot-pounds for mechanical energy; kilowatt-hours for electrical energy;
and million electronVolts (MeV) for nuclear energy. However, since all these units describe the same fundamental entity, there must be conversion factors relating them all. To make matters more even confusing, there are a whole host of separate units for the quantity power, which refers to the rate at which energy is produced or consumed, i.e.,

المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .