Translator: Ahmed Mohamed Auditor: Omar Aljubbah
Energy surrounds us,
It is a physical quantity that follows the exact laws of nature.
Our world contains a certain amount of it
They are neither created nor perished
But it takes many forms.
Like static energy or kinetic energy,
With many different properties and formats.
For example,
It transforms into a 6 watt LED desk lamp
6 joules of light energy per second.
But let's go back to space
To look at our planet, its systems, and its energy flow.
The terrestrial physical system includes
Atmosphere, and hydrosphere
Earth's crust and biosphere.
Energy moves to and from these systems,
And during any energy transfer between them,
Some are lost in the environment
As heat, light, or sound
Or vibration or movement.
The energy of our planet comes from internal and external sources.
The geothermal energy comes from radioisotopes
The rotational energy of the Earth's rotation
Both are internal energy sources,
While the sun is the primary external source,
It controls certain systems, such as weather and climate
Sunlight heats the surface and atmosphere in different proportions.
This causes a heat load.
It produces winds and affects ocean currents.
Infrared rays radiated by hot surfaces on Earth,
They are locked up by some gases which also affect the flow of energy.
The sun is the main source of energy for living things as well.
Plants, algae, and green bacteria
Sunlight is used to produce organic matter
Of carbon dioxide and water,
Reinforced food chains for the biofilm.
We release this food energy via chemical reactions.
Like burning and breathing.
At each stage of the food chain, some energy is stored
Into new chemical constructs,
But the bulk is lost in the surrounding medium,
In the form of heat, like your own body temperature,
Caused by your digestion of food.
Since plants are eaten by the primary consumers,
Only 10% of their total energy goes to the next level.
Since energy only flows in one direction in the food chain,
From producers to consumers and analyzers,
Organisms that eat less in the food chain,
More effective than the top ones.
So eating the producing organisms is the most effective stage
From which an animal can obtain energy
But without the constant supply of energy to these producers
Which is mostly from sunlight,
Life on Earth as we know it will be gone.
For us humans, of course, we use up our energy to do many things besides eating.
We travel, build, and power all kinds of technology
Let's do all this,
We use sources such as fossil fuels:
Coal, oil, natural gas,
Which contain energy
Plants collected from sunlight since ancient times
And stored as carbon derivatives.
When we burn fossil fuels in power plants
We release that stored energy
Let's generate electricity.
Let's generate electricity,
The heat from burning fossil fuels is used to power turbines
Which spin a magnet (magnets),
Which, in turn, generates a changing magnetic field
For a coil of wire,
This induces the electrons to flow through the wire.
An advanced civilization depends on our capabilities
To keep those electrons flowing.
Fortunately, we are not restricted to burning non-renewable fossil fuels
To generate electricity.
Electrons can be induced to flow
By interacting directly with particles of light,
It is the way solar cells work.
Other renewable energy sources,
Like wind and water
Earth's subsoil energy, and organic fuel
They could be used to generate electricity.
Global energy demand is increasing,
But the planet has limited energy sources
To get it through a complex infrastructure.
As the population increases,
Besides the rates of industrial development and transformation,
Talking about energy becomes more important.
Energy access affects health, education,
Political forces, and societal economic situation.
If we develop our energy efficiency,
We can use our natural resources better
To improve the quality of life for all.