define useful energy?

Answer 1

useful Energy is simply energy that goes into work, as opposed to being lost as heat etc.

For example, in a petrol (gasoline) engine, perhaps only 60% of the energy released through combustion is used in driving the car forwards. The other 40% is lost as heat. So only 60% is USEFUL ENERGY.

Answer 2

Define Useful

Answer 3

In general, the concept of energy refers to "the potential for causing changes." The word is used in several different contexts. The scientific use has a precise, well-defined meaning, whilst the many non-scientific uses often do not.

In physics, energy is mathematically defined as a work done by a certain force (gravitational, electric, magnetic, force of inertia, etc) and usually taken with a negative sign. Due to variety of forces, energy has many different forms (usually named after specific force involved), however these can be broken down into two main forms: kinetic energy and potential energy. According to the above definition, energy has the same units as work; a force applied through a distance. The SI unit of energy, the joule, equals one newton applied through one meter, for example.

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Answer 4

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define useful energy?

Answer 5

Water possesses useful potential energy because of its elevation. Gravity attracts the water toward the center of the earth. However, it is possible at most to obtain useful energy from the water only as it falls through a dam and water turbine from its reservoir surface elevation to sea level (and usually much less depending on location of the dam). In like manner, useful energy can be extracted from high pressure steam only to atmospheric pressure unless a steam condenser is used to lower the steam turbine discharge pressure. Heat can flow only to ambient temperature or cooling water temperature known as a heat sink.

Answer 6

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unless you very specifically and carefully define "useful energy", then i am going to have to go with: this item does not exist.. all machines that i am aware of are *lot* less than 100% efficient. friction, air resistance, viscosity, etc, are about impossible to avoid in practical real-life situations... cheers

Answer 7

in biological terms ATP, adenosine-5-triphosphate, its the universal energy source of all life on this planet, in other terms life wouldnt exist without it, its drives almost every metabolic process in every single organism, its about as usefull as u need in biology, cos its in this genre i thought the other answers werent exactly what u were lookin for