- 0 Talk
-
Energy
Contents |
Introduction
Edit
Energy gives personal comfort and mobility to people, and is essential for the generation of industrial, commercial and societal wealth. On the other hand, energy production and consumption place considerable pressures on the environment (including heat and electricity production, oil refining and its final use in households, services, industry and transport). These pressures include the emission of greenhouse gases and air pollutants, land-use, waste generation and oil spills. They contribute to climate change, damage natural ecosystems and the man-made environment, and cause adverse effects to human health.
Energy is in everything. We use energy to do everything we do, from making a jump shot to baking our favorite cookies to sending astronauts into space -- energy is there, making sure we have the power to do it all.
Different types of energyEdit
Energy comes in different forms. The main types of energy is thermal (heat), radiant (light), mechanical, electrical, chemical, and nuclear energy.
Energy can be transformed into another sort of energy, but it cannot be created and it cannot be destroyed. Energy has always existed in one form or another. This is referred to the law of thermodynamics
Energy can be divided into two types:
- Stored energy (potential energy).
- Moving energy (kinetic energy).
How Do We Measure Energy?Edit
Energy is measured in many ways. One of the basic measuring blocks is called British thermal unit (Btu) which describes the amount of heat energy it takes to raise the temperature of one pound of water by one degree Fahrenheit, at sea level.
Energy also can be measured in joules, where a thousand joules equals a British thermal unit [1,000 joules = 1 Btu)
Energy useEdit
Energy resources can be divided into renewable and non-renewable energy.
Renewable energyEdit
Renewable energy sources include solar energy, which comes from the sun and can be turned into electricity and heat. Wind, geothermal energy from inside the earth, biomass from plants, and hydropower and ocean energy from water are also renewable energy sources.
Non Renewable energyEdit
Non renewable energy sources includes fossil fuels such as oil, gas, and coal.
See alsoEdit
| |||||
