ENERGY

ENERGY

Phyo : 27-Sept-2010

- Kinetic Energy- Potential Energy- Electrical Energy- Mechanical Energy- Chemical Energy- Thermal Energy

- Sleep- Activity- Force- Resources- Life- Strength- Eat- Joule (J/kJ)

ENERGY cannot be created or destroyed. It can only be transformed.

ENERGY

ENERGY

Word Origin & History

energy 1590s, from M.Fr. energie , from L.L. energia , from Gk. energeia "activity, operation," from energos "active, working," from en- "at" + ergon "work" (see urge (v.)). Used by Aristotle with a sense of "force of expression;" broader meaning of "power" is first recorded in English 1660s. Energy crisis first attested 1970.

- Online Etymology Dictionary, © 2010 Douglas Harper

In physics, energy (from Greek ἐνέργεια - energeia, "activity, operation", from ἐνεργός - energos, "active, working”) is a quantity that is often understood as the ability to perform work.

This quantity can be assigned to any particle, object, or system of objects as a consequence of its physical state.

ENERGYEnglish Dictionary: 1. intensity or vitality of action or expression; forcefulness2. capacity or tendency for intense activity; vigour3. vigorous or intense action; exertion4. Physics

a. the capacity of a body or system to do work b. E a measure of this capacity, expressed as the work that it does in changing to

some specified reference state. It is measured in joules (SI units)5. kinetic energy See also potential energy a source of power 6. the habit of vigorous activity; vigor as a characteristic: Foreigners both admire and laugh at American energy. 7. the ability to act, lead others, effect, etc., forcefully. 8. Physics . the capacity to do work; the property of a system that diminishes when the system does work on any other system, by an amount equal to the work so done; potential energy. Symbol: E 9. any source of usable power, as fossil fuel, electricity, or solar radiation

Science Dictionary: The capacity or power to do work, such as the capacity to move an object (of a given mass) by the application of force. Energy can exist in a variety of forms, such as electrical, mechanical, chemical, thermal, or nuclear, and can be transformed from one form to another. It is measured by the amount of work done, usually in joules or watts.

ENERGY

POWER

Word Origin & History

power c.1300, from Anglo-Fr. pouair, O.Fr. povoir, noun use of the infinitive in O.Fr., "to be able," earlier podir (842), from V.L. *potere, from L. potis "powerful" (see potent). Meaning "a state or nation with regard to international authority or influence" is from 1726. The verb meaning "to supply with power" is recorded from 1898. Powerful is c.1400. Powerhouse "building where power is generated" is from 1881; fig. sense attested from 1915. Power-broker (1961) said to have been coined by T.H. White in ref. to the 1960 U.S. presidential election. Phrase the powers that be is from Rom. xiii.1. As a statement wishing good luck, more power to (someone) is recorded from 1842.

- Online Etymology Dictionary, © 2010 Douglas Harper

In physics, power is the rate at which work is performed or energy is converted

ENERGY

English Dictionary: 1. to supply with electricity or other means of power: Atomic energy powers the new submarines. 2. to give power to; make powerful: An outstanding quarterback powered the team in its upset victory. 3. to inspire; spur; sustain: A strong faith in divine goodness powers his life. 4. Political power5. Influential power6. Authority

POWER

ENERGY

Energy in a system may be transformed so that it resides in a different state. Energy in many states may be used to do many varieties of physical work. Energy may be used in natural processes or machines, or else to provide some service to society (such as heat, light, or motion). For example, an internal combustion engine converts the potential chemical energy in gasoline and oxygen into heat, which is then transformed into the propulsive energy (kinetic energy that moves a vehicle.) A solar cell converts solar radiation into electrical energy that can then be used to light a bulb or power a computer.

Energy Conversion

ENERGY

Primary energy is energy found in nature that has not been subjected to any conversion or transformation process. It is energy contained in raw fuels as well as other forms of energy received as input to a system.

Primary Energy

e.g.:-Solar energy-Wind power energy-Fossil Fuels-Hydro Power Energy

Secondary Energy

Secondary energy is more convenient forms of energy, such as electrical energy, refined fuels, or synthetic fuels such as hydrogen fuel.

e.g.:-Electricity-Petrol/Fuel

Energy Conversion

ENERGY

Energy Usage

ENERGY

Exergy is the energy that is wasted/unwanted energy. Usually up to 60% of energy produced is exergy.

-How do we re-harvest/recover the exergy to be usable as energy?-Technologies that are available are not good enough to fully utilize the energy that is being produced resulting in excess exergy?

Exergy

EXERGY

Energy Environment

SustainableDevelopment

ENERGY

A Low-energy house is any type of house that from design, technologies, and building products and uses less energy, from any source, than a traditional or average contemporary house.The term could also refer to any dwelling whose energy use is below the standards demanded by current building codes. Because national standards vary considerably around the world, 'low energy' developments in one country may not meet 'normal practice' ones in another.

Low Energy Building

A zero energy building (ZEB) or net zero energy building is a general term applied to a building's use with zero net energy consumption and zero carbon emissions annually.

Zero Energy Building

An energy-plus-house produces more energy from renewable energy sources, on average over the course of a year, than it imports from external sources.

Plus Energy Building

ENERGY

Off-the-grid buildings are stand-alone ZEBs that are not connected to an off-site energy utility facility. They require distributed renewable energy generation and energy storage capability (for when the sun is not shining, wind is not blowing, etc.).

An energy autarkic house is a building concept where the balance of the own energy consumption and production can be made on an hourly or even smaller basis. Energy autarkic houses can be taken off-the-grid.

Off-grid / On-grid

Energy Autarkic House:A building concept where the balance of the own energy consumption and production can be made on an hourly or even smaller basis.

- Able to produce enough/more energy than required at any given time.

ENERGY

Energy conservation refers to efforts made to reduce energy consumption. Energy conservation can be achieved through increased efficient energy use, in conjunction with decreased energy consumption and/or reduced consumption from conventional energy sources.

Energy Conservation

On 1 Apr 01, the Ministry of the Environment and Water Resources (MEWR) formed the National Energy Efficiency Committee (NEEC).

With the announcement of Singapore’s plan to accede to the Kyoto Protocol in 2006, the NEEC has been expanded in scope to cover climate change issues and has been renamed the National Climate Change Committee (NCCC) to better reflect its expanded function.

ENERGY

On-site available energy – renewable energy:- sunlight- wind- rain

Energy that a Site Offers

Renewable vs Non-Renewable