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Technology

Grade 8

Electricity

Module 13

Safety measures concerning electricity

Activity 1

To familiarize learners with safety measures concerning electricity

LO 1.12

You have possibly already experienced an electrical shock. If so, you will have found out that it has an impact on your body. The power of the electrical current determines the shock on your body – if the body is unable to handle the shock, you may die. Therefore it is impor­tant for your safety and that of other people that certain measures are observed when working with electricity.

Most electrical appliances are earthed in order to safeguard you. Earthing is essential see­ing that it leads the current away to the ground in case of an electrical short-circuit. This prevents a person from being shocked by the appliance if he/she were to touch it. The electrical appliance is connected to the earth so that electric power will be discharged immediately and without any danger.

Assignment 1

2.1 Mention four safety measures that should be applied at all times.

2.2 What should you do if someone suffers an electric shock?

2.3 Make a sketch in colour of an electrical plug to illustrate the correct coupling.

2.4 In an electrical plug, why is the earth pin longer than the other two pins?

2.5 Produce an A4 poster that illustrates a safety measure. Insert it as an extra page.

LO 1.12

Focus task 1

You now have the opportunity to couple an electrical plug to an electrical cord. The sketch shows you how to remove the isolating material. Your teacher will guide you with the actual coupling.

Assessment

Learning outcomes(LOs)
LO 1
TECHNOLOGICAL PROCESSES AND SKILLS The learner will be able to apply technological processes and skills ethically and responsibly using appropriate information and communication technology.
Assessment standards(ASs)
This is demonstrated when the learner:
investigates:1.1 investigates the background context, the nature of the need, the environmental situation, and the people concerned when given a problem, need or opportunity set in a nationally relevant context;
1.2 compares existing products relevant to the problem situation based on:
  • safety;
  • suitability of materials;
  • fitness for purpose;
  • cost;
1.3 develops and performs practical tests in the technological knowledge areas (structures, processing and systems and control);
1.4 uses appropriate technologies and methods to:
  • collect relevant data from different sources or resources;
  • extract relevant data;
  • make meaningful summaries;
  • use information to justify and support decisions and ideas;
designs:1.5 writes or communicates a short and clear statement or a design brief in response to a given identified situation for the development of a product or system;
1.6 lists product and design specifications and constraints for a solution to an identified or given problem, need or opportunity based on most of the design key words listed below:
  • people: age, target market, human rights, access;
  • purpose: function, what product will do;
  • appearance: colour, shape;
  • environment: where the product will be used or made, impact on the environment;
  • safety: for users and manufacturers;
  • cost: cost of materials, wastage, cost of manufacture, maximum selling price;
1.7 generates several alternative solutions and writes notes, ideas that show links to the design brief, specifications and constraints;
1.8 chooses possible solutions based on well-reasoned argument and develops the chosen idea to include more specific details using graphic and / or modelling techniques;
makes:1.9 develops a plan for making that includes all of the following:
  • resources needed ;
  • sketches showing the necessary dimensions or quantities;
  • all the steps necessary to make the product;
1.10 chooses and uses appropriate tools and materials to make products by measuring, marking, cutting or separating, shaping or forming, joining or combining, and finishing different materials accurately using appropriate techniques;
1.12 uses safe working practices and shows awareness of efficient ways of using materials and tools;

Memorandum

ACTIVITY 1

Becoming acquainted with safety precautions concerning electricity. LO 1.12

  • Learners should gain a thorough understanding of the dangers of electricity. If electricity is not used with the necessary caution, its use can be fatal. In Focus Task 1, you could use electric wire without a power supply. All learners should be given an opportunity to plug in a power plug/wall plug.

Assignment 2

1. Do not overload wall plugs.Ensure that electrical; cords are in good condition.Avoid using electricity near water.Avoid joining electrical cords.

2. Switch off the power supply.Use non-conducting materials to free the person from the power supply and pull the victim away by his/her clothing.If the victim is unconscious, mouth-to-mouth resuscitation should be applied.

3. L — brownN — blueE — green and yellow

4. current and the cover of the appliance, it is necessary to lead the current to the earth to avoid an electrical shock if anybody should touch the appliance.

5.. Learners' own attempts.

Questions & Answers

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.
Bharti
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
Daniel
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
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
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
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
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
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
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
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
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.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
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Source:  OpenStax, Technology grade 8. OpenStax CNX. Sep 13, 2009 Download for free at http://cnx.org/content/col11052/1.1
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