Energy conversion efficiency (η) is the ratio between the useful output of an energy conversion machine and the input, in energy terms.

The World Energy Council estimates that nearly two thirds of all primary energy is lost before it is converted to useful energy.

We believe that nuclear energy, when produced in accordance with safety and environmental procedures, can be a useful way of meeting the increasing energy demand worldwide.

This heat is useful for the majority of heating applications, however, it is sometimes not practical to transport heat energy over long distances, unlike electricity or fuel energy.

It comes in on the side the useful stuff is the dark gray, and the un useful stuff, which is called the rejected energy the waste, goes up to the top.

The advent of shale gas has confused the energy debate even more. If gas is substituted for coal, it can be a useful bridge to a low carbon future.

In fact, many useful innovations, such as energy generating building materials and zero emissions transportation, already exist they simply need to be made accessible to those who need them most.

Make yourselves useful.

Berber is useful.

Berber is useful.

Electricity is very useful.

Useful information about Bangkok

Examples may prove useful to aid in documenting a service to the level where it becomes useful.

Very useful second ecosystem service.

30 useful plugins for pidgin

This website is very useful.

Personal computers are very useful.

The Berber language is useful.

The Berber language is useful.

An analogy may be useful.

That alone can be useful.

That was a useful signal.

IMRIE scoring is also useful.

All have added useful information.

So very small, but very useful.

You'll find this map very useful.

This dictionary isn't useful at all.

The first useful lesson concerns expectations.

Foam end of useful life issues

a In the context of Renewables 2004, renewable energy sources and technologies include solar energy, wind energy, hydropower, biomass energy including biofuels, and geothermal energy.

This dictionary is not useful at all.

Sometimes, the wrong friends can be useful.

But it is also not very useful.

many posts when only one is useful

This knife was very useful to me.

The news media are another useful source.

Statistical indicators are useful for measuring inequality.

A useful example is the cooperation between Brazil s state owned energy giant Petrobras and Prominp a coalition of government agencies, businesses, trade associations, and labor unions aimed at unleashing the full potential of the country s oil and gas sector.

When combined with renewable energy sources, hydrogen energy provides the ultimate clean energy system.

More tantalizing for humanity s need for widely available, clean base load power is the non conventional geothermal energy called hot dry rocks, or HDR. With HDR, useful heat is present in rocks only a few kilometers below the Earth s surface.

This task installs software useful for a laptop.

He buys only what'll be useful for him.

I think this dictionary is useful for beginners.

A couple of other useful changes will follow.

It is always useful to have a scapegoat.