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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

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
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
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
how can I make nanorobot?
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?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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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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