27-08-2013, 02:03 PM
Energy: Forms and Changes
Energy: Forms .ppt (Size: 557 KB / Downloads: 19)
Nature of Energy
Energy is all around you!
You can hear energy as sound.
You can see energy as light.
And you can feel it as wind.
Forms of Energy
The five main forms of energy are:
Heat
Chemical
Electromagnetic
Nuclear
Mechanical
Heat Energy
The internal motion of the atoms is called heat energy, because moving particles produce heat.
Heat energy can be produced by friction.
Heat energy causes changes in temperature and phase of any form of matter.
Electromagnetic Energy
Light is a form of electromagnetic energy.
Each color of light (Roy G Bv) represents a different amount of electromagnetic energy.
Electromagnetic Energy is also carried by X-rays, radio waves, and laser light.
Nuclear Energy
When the nucleus splits (fission), nuclear energy is released in the form of heat energy and light energy.
Nuclear energy is also released when nuclei collide at high speeds and join (fuse).
Mechanical Energy
When work is done to an object, it acquires energy. The energy it acquires is known as mechanical energy.
Energy conversions
All forms of energy can be converted into other forms.
The sun’s energy through solar cells can be converted directly into electricity.
Green plants convert the sun’s energy (electromagnetic) into starches and sugars (chemical energy).