Energy: Energy Overview

When the world speaks about energy, invariably it speaks about energy supplies.

At the center of energy issues in the United States is the growing realization that in order to sustain this level of energy consumption, a transition away from fossil fuels to more reliable and sustainable sources is needed.

From The Columbia Encyclopedia
Fuel made from natural, renewable sources, such as new and used vegetable oils and animal fats, for use in a diesel engine.

The energy stored in the nucleus of an atom and released through fission, fusion, or radioactivity.

Renewable energy is the energy produced by using natural resources that will regenerate in time. Primary sources of renewable energy are water, geothermal heat, wind, and sunlight. The energy produced by using different organic materials, such as wood, agricultural rejects, forestry residues, and urban solid waste (called biomass) is also regarded as “renewable.”

Energy from sunlight is one of the world's most important natural resources. Fossil fuels and agriculture would be impossible without it. Solar power has been used for thousands of years, and the technology continues to evolve.

Harnessing of wind energy to produce power. Since the 1970s, advanced aerodynamic designs have been used to build wind turbines that generate electricity.

Structure built across a river to hold back a body of water (called a reservoir) in order to prevent flooding, provide water for irrigation and storage, and provide hydroelectric power.

In electricity, machine used to change mechanical energy into electrical energy.

Electric cell in which the chemical energy from the oxidation of a gas fuel is converted directly to electrical energy in a continuous process (see oxidation and reduction). MORE

Rotary engine that uses a continuous stream of fluid (gas or liquid) to turn a shaft that can drive machinery.

"Public access gateway for energy & science"

from the U.S. Department of Energy