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Hiện có 2 người đang truy cập Diễn Đàn, gồm: 0 Thành viên, 0 Thành viên ẩn danh và 2 Khách viếng thăm


Số người truy cập cùng lúc nhiều nhất là 30 người, vào ngày Tue Oct 18, 2011 10:44 pm
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Diễn Đàn hiện có 163 thành viên
Chúng ta cùng chào mừng thành viên mới đăng ký: pasalbtsg

Tổng số bài viết đã gửi vào diễn đàn là 1776 in 612 subjects

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 Năng lượng là gì?

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Tổng số bài gửi : 814
Join date : 19/10/2011

Bài gửiTiêu đề: Năng lượng là gì?   Tue Dec 03, 2013 11:07 pm

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Tổng số bài gửi : 814
Join date : 19/10/2011

Bài gửiTiêu đề: Re: Năng lượng là gì?   Sat Jan 04, 2014 10:56 am

Còn đây là các định nghĩa bằng tiếng ANh về năng lượng! Nếu bạn hiểu khác người khác thì cũng là điều bình thường ! Very Happy =))
(physics) the capacity of a physical system to do work; the units of energy are joules or ergs; "energy can take a wide variety of forms"
forceful exertion; "he plays tennis with great energy"; "he's full of zip"
enterprising or ambitious drive; "Europeans often laugh at American energy"
an imaginative lively style (especially style of writing); "his writing conveys great energy"; "a remarkable muscularity of style"
a healthy capacity for vigorous activity; "jogging works off my excess energy"; "he seemed full of vim and vigor"
Department of Energy: the federal department responsible for maintaining a national energy policy of the United States; created in 1977

Energy is a fundamental quantity that every physical system possesses; it allows us to predict how much work the system could be made to do, or how much heat it can produce or absorb. In the past, energy was discussed in terms of easily observable effects it has on the properties of objects or changes in state of various systems. Basically, if something changes, some sort of energy was involved in that change. ...

Energy is a 1988 album by the punk band Operation Ivy.

Energy is a term used by humans to describe intangible, but perceptible, variations in emotional and physical stamina and motivation.

The capacity for doing work. Forms of energy include thermal, mechanical, electrical, and chemical. Energy may be transformed from one form into another.

The ability to do work. People get energy from food. Your toaster and your washing machine get their energy from electricity.

the capacity for doing work.

The capacity for doing work as measured by the capability of doing work (potential energy) or the conversion of this capability to motion (kinetic energy). Energy has several forms, some of which are easily convertible and can be changed to another form useful for work. Most of the world's convertible energy comes from fossil fuels that are burned to produce heat that is then used as a transfer medium to mechanical or other means in order to accomplish tasks. ...

is the property something has that enables it to do work. The unit of energy is the joule (J). The basic forms of energy are kinetic energy, potential energy, and rest energy. The law of conservation of energy states that energy can be neither created nor destroyed, although it may change from one form to another (including mass). ... ossary.htm

The capacity to do work. ... ssary.html

A property of a body related to its ability to move a force through a distance opposite the force's direction; energy is the product of the magnitude of the force times the distance. Energy may take several forms: see kinetic energy, potential energy, and elastic energy.

a biological resource used to control the environment. analog: tension. ... ossary.htm

the ability to do work

The fundamental substance of everything in the universe. The nonphysical factors of our lives are energetic in nature. Energy is characterized by vibration and the impulse to move.

A measure of being able to do work. There are many forms of energy, such as heat, mechanical, electrical, radiant, chemical, and nuclear energies. Energy is measured in such units as the joule (J), erg, kilowatt-hour (kW-hr), kilocalorie (kcal), foot-pound (ft-lb.), electron-volt (ev), and British thermal unit (BTU).

A measure of work done by an electrical system over a given period of time, often expressed in kilowatt-hours (kWh).

The ability to cause matter to move or change. ... sary.shtml

usable power obtained from various sources; photoautotrophs obtain energy from the sun; heterotrophs obtain energy from their food

Elementary textbooks often say "there are many forms of energy, kinetic, potential, thermal, nuclear, etc. They can be converted from one form to another." Let's try to put more sturcture to this. There are really only two functional categories of energy. The energy associated with particles or systems can be said to be either kinetic energy or potential energy.

loosely, anything that can cause a machine to move. For example, energy is contained by moving water, water raised to a high place, heat or magnetic fields. The energy of fast ions and electrons (measured in "electron volts") is a measure of their speed, and it enables them (for instance) to penetrate matter.

the quantity that has to be minimized for a mechanical system to be in equilibrium; alternatively: a property of the dynamics of a mechanical system

Non-material property capable of causing changes in matter. [J]

The result of consuming power over a period of time. In electricity, measured in watthours: 1000 watthours = 1 kilowatt hour, or the equivalent of a 100 watt bulb running for 10 hours. Most electricity rates/prices for residential service are quoted in kilowatt-hours. In gas, measured in volumes of gas (cubic feet) or a proxy for volumes (therms, qv).

The ability to do work. Motion, heat, light, and sound are all forms of energy. ... ssary.html

The ability to work (ie, exert a force over distance). Energy is measured in calories, joules, KWH, BTUs, MW-hours, and average MWs. ... rydam.html

We refer to the available, usable energy, not its absolute level. ... ossary.htm

UP 6602-B [PDF file] for coal trains originating in Colo. or Utah UP 6603-B [PDF file] for coal trains originating in Wyoming UP 6605-A [PDF file] for coal trains originating in Illinois

The work that a physical system is capable of completing or doing.

Energy comes in different forms – heat (thermal), light (radiant), mechanical, electrical, chemical, and nuclear. There are two types of energy – stored (potential) energy and working (kinetic) energy. For example, the energy from the food that you eat is stored in your body as chemical energy until you use it. Much of the energy we use comes from non-renewable sources such as fossil fuels (coal, oil and gas). Renewable energy sources include solar power, wind power and hydroelectric power.
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