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Loreto Arcos Villa

on 6 August 2014

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Transcript of Energy

Where and when do we use energy?
We use energy all the time. Humans use energy to be active – to walk, talk, play basketball, etc. We use energy to power our appliances, vehicles, lights, etc. Cells use energy to perform the most basic life functions. Life as we know it would not be possible without energy production and consumption.
Energy is everywhere!
- You can feel it (wind)
- You can taste it (food)
- You can hear it (sound)
- You can see it (light)

Sometimes is hard to say where it is.
Energy can move and change, but it cannot be destroyed.
It is similar to the heat you feel coming off a light bulb while it is on. The warmth is light energy changed to heat energy. Whatever form it is in, energy is essentially the ability for making something happen or, as scientists put it, "doing work."
Where do we get energy?
Energy comes from many sources, directly or indirectly: power plants, people, food, light, windmills, turbines, fires, electrical circuits, the sun, machines, etc. All energy originally comes from natural resources, most of which originate from the sun.

Energy is essentially
the capacity for making
something happen or,
as scientists put it,
"doing work."
How are energy sources categorized?
Some of them

is the combustion of materials that originate from living things.

drives many small machines and keeps lights glowing.

Geothermal taps steam
from water heated underground (like geysers) and uses it to spin turbines.

generates electricity by harnessing the power of flowing water (a renewable resource as long as there is rain).

is the energy of motion. A spinning top, a falling object, and a rolling ball all have kinetic energy. The motion, if resisted by a force, does work. Wind and water both have kinetic energy.

Light energy
is generated from light bulbs and computer screens, the sun.

Nuclear fusion
imitates the method the sun uses to produce energy. It involves the joining together of the nuclei of hydrogen atoms.
Nuclear fission is when energy is given off from splitting nuclei of uranium atoms.

Potential energy
is the energy stored by an object as a result of its position. For example, roller coaster at the top of a hill.

Sound energy
is created, for example, when a door slams, it releases sound energy.

Solar energy
occurs from the sun (light).

Thermal energy
(or heat) boils water, keeps us warm and drives engines.

Tidal energy
is when the energy from ocean tides is harnessed.


Full transcript