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Natural sciences

Grade 4

Energy and change

Module 32

Man’s use of electrical energy


To investigate man’s use of electrical energy

[lo 1.2, 1.3, 2.2]

In our own country, South Africa

We get electricity from power stations that supply power to the whole country. The electricity supply of each town or city depends on the size of the area, the number of houses, the number of factories and the number of people.

Find pictures to represent the uses of electricity in your town or city. Paste the pictures in the space provided below.

Write a short sentence on the use of electricity in the following places: Describe how the people who belong to your culture found safe ways of using electricity in years gone by.

On farms

In factories:

In mining areas:

In our community:

List the situations in which electricity is used in our community.

Three assignments follow. Choose one and act out the event of your choice.

There is a power failure at your school. Show through your acting how it affects

  1. you?
  2. your educator?
  3. the caretaker?
  4. the secretary?
  5. the principal?

Some schools in our country have no electricity. How do you think the staff and learners manage to do the schoolwork?

There is a power failure at the hospital. Show through your acting how it affects

  1. the patient?
  2. the doctor and nursing staff?
  3. the kitchen?
  4. the theatre?

There is a power failure at the supermarket. Show through your acting how it affects

  1. the clientele?
  2. the manager?
  3. the cash register?
  4. the bakery section?
  5. the meat section?
  6. the cooling system/fridges?



The 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

1.2 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

2.2 categorises information.


In our country, South Africa

Write a short sentence on the utilization (use) of energy in the following places. (The learners must write their own sentences according to their cultural group, to indicate how safe methods of using energy have been found throughout the past years. These sentences are merely guidelines.)

On farms:

A farmer uses electricity to save time, energy and money, but then he might not need so many workers.

In factories:

Factories cannot run without electricity. The machines that make products work for very long hours.

In mining areas:

Machines that are used in mines use electricity. This saves time and makes the miners’ work easier.

In our community

Make a list of where we use electricity in our community.

  • Homes
  • Supermarkets
  • Chemist shops
  • Hospitals
  • Streets
  • Shopping centres
  • Churches
  • Any other acceptable answers

Questions & Answers

do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
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.
what is the actual application of fullerenes nowadays?
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.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
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.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
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
anybody can imagine what will be happen after 100 years from now in nano tech world
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
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Mueller Reply
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Source:  OpenStax, Natural sciences grade 4. OpenStax CNX. Sep 18, 2009 Download for free at http://cnx.org/content/col11096/1.1
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