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Natural sciences

Grade 4

Energy and change

Module 33

Saving electricity


To discuss ways of saving electricity

[lo 3.2]

Bring old electricity accounts from your homes to school and discuss them. See how the amounts on the accounts vary from month to month, from winter to summer and from house to house.

Discuss suggestions on how to economize on the use of electricity at home. Share your ideas with you parents when you are at home.

How to save electricity

Examine the pictures below. Indicate where you agree by placing a tick in the appropriate place and indicate where you disagree by placing a cross in the appropriate place.

Do not put warm food or fluids in the fridge.

Do not boil water in a pot on the stove – rather use the kettle.

Do not use a pot with an uneven bottom, because it requires more heat.

Do not use a big stove-plate to heat up a small pot or saucepan – unused heat is wasted.

Do not use the stove as a heater – a heater works cheaper.

Switch off lights when they are not necessary.

Do not use more than necessary warm water to bath.

You use less water when you shower than when you bath.

Use cold water to do your washing.

REMEMBER: you pay for the electricity that you waste!

Select a room in your home. Look through old magazines to find and cut out pictures of the appliances that you use most frequently in that room. Advertisements from furniture stores will also be handy for this. Paste the pictures in the space below.


LEARNING OUTCOME 3: SCIENCE, SOCIETY AND THE ENVIRONMENTThe learner will be able to demonstrate an understanding of the interrelationships between science and technology, society and the environment.

Assessment Standard

We know this when the learner

3.2 understands the impact of Science and Technology.


How to conserve (save) electricity:

  • It is wrong to put warm food in the refrigerator.
  • Boiling water in a saucepan is wrong; in a kettle is correct.
  • A warped saucepan is wrong; a level (flat) base is correct.
  • A small saucepan on a large plate is wrong; a small saucepan on a small plate is correct.
  • A stove as a heater is wrong; a proper heater is correct.
  • To switch off unnecessary lights is correct.
  • Too much water in a bath is wrong.
  • Having a shower is correct.
  • Hot water for washing is wrong.

Questions & Answers

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
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
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
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit 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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