# 2.3 Making energy available to people

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## Making energy available to people

MAKING ENERGY AVAILABLE TO PEOPLE

Energy from sunlight is stored in and around the earth in several ways. (In some instances temporarily, as when the earth is warmed by the sun, or for longer periods of time, for instance when it is fixed in food). The stored energy can be released later and be used.

Let us take a look at some of the means by which it may be released

## [lo 1.1, 1.2, 1.3, 2.1]

See how many of the following idiomatic expressions that have developed around the idea of wind are known to you?

• We got wind that you were coming (we were given a hint)
• His talk was all wind (it was insubstantial)
• Between wind and water (a vulnerable spot, as the part of a ship that is normally below water but is exposed when the ship rolls)
• How the wind blows (what appears probable)
• In the wind (about to happen)
• Three sheets in the wind (intoxicated or drunk)
• Sail close to the wind (come near the limits of danger)
• Take the wind out of someone’s sails (destroy someone’s advantage)

What is wind?

Blow on your hand. What do you notice?

We cannot see the wind, but we can feel it when it blows against our faces or ruffles our hair.

Washing dries quickly if it is hung out in the wind.

Do you know the reason for this?

How does wind occur?

Complete the sentences to explain the illustration by supplying the missing words:

1. By day the sun . It .

the land.

1. Warm air .
2. Cooler air moves from the to the

to take the place of the warm air.

1. This is how originates.

Make a windmill

• Use stiff paper. Cut it according to the instructions on the illustrations.
• Will this windmill turn in a room where there is no wind?
• What could you do to make it turn?
• Discuss suggestions about how to increase the windmill’s turning speed with your friends and report your ideas to the class.

Folding a small paper glider:

• Fold a sheet of A4 paper in half lengthways.
• Unfold the sheet of paper and fold the two top corners to the central fold so that the top edges lie together.
• Fold the new corners to the central fold, forming a sharp arrow point.
• Fold back the arrow point to the point at which the other points meet.
• Fold along the original lengthways fold again to “close” the structure.
• Fold the bottom corners separately to form wings.
• Fold back both wings along a line lying parallel to the central fold.
• Hold below and throw gently, noting how far the glider glides!
• You may experiment to see which folding pattern allows the glider to glide better. Demonstrate this to the class and motivate your explanation.

Ways in which wind is used to the benefit of people

People have always made use of the power of wind to achieve things.

People have used the wind to their advantage. Sailors use the power of the wind that blows against their sails to drive their ships.

Windmills have been used to grind wheat and wind pumps pump water from below the ground.

The wind blows against the sails of the mill or the vanes of the wind pump to turn them. This turning turns machinery inside the mill. Modern windmills are called turbines and are used to provide electricity.

Class project

Let’s build a kite! First name and describe the materials that we could use for this project. Then form groups to build kites.

## Assessment

LEARNING OUTCOME 1: SCIENTIFIC INVESTIGATIONSThe learner will be able to act confidently on curiosity about natural phenomena, and to investigate relationships and solve problems in scientific, technological and environmental contexts.

Assessment Standard

We know this when the learner

1.1 plans investigations;

• leads investigations and collects data;
• evaluates data and provides feedback on observations.

LEARNING OUTCOME 2: CONSTRUCTING SCIENCE KNOWLEDGE

The learner will know and be able to interpret and apply scientific, technological and environmental knowledge.

Assessment Standard

We know this when the learner

2.1 recalls significant information.

## Memorandum

What is wind?

I feel air on my hand.

The wind shakes drops of water from the washing. The vapour from the washing disappears into the air.

Where does the wind come from?

Complete the sentences by using the missing words in order to explain the illustration:

1. shines, warm

2. rises

3. sea, land

4. wind

Make a windmill

Use a sheet of firm paper. Fold it according to the instructions on the illustrations.

Does a windmill turn in a room where there is no air current (wind)? No!

What can you do to make it turn? I can run while holding it in the air.

how to know photocatalytic properties of tio2 nanoparticles...what to do now
it is a goid question and i want to know the answer as well
Maciej
Do somebody tell me a best nano engineering book for beginners?
what is fullerene does it is used to make bukky balls
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
for screen printed electrodes ?
SUYASH
What is lattice structure?
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
what's the easiest and fastest way to the synthesize AgNP?
China
Cied
types of nano material
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
what is nano technology
what is system testing?
preparation of nanomaterial
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
what is system testing
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
how did you get the value of 2000N.What calculations are needed to arrive at it
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