<< Chapter < Page Chapter >> Page >

Natural sciences

Grade 4

Energy and change

Module 35

Dangerous ways of using electricity


To identify dangerous ways of using electricity

[lo 1.3, 2.2, 3.2]

When could electricity be dangerous?

What is wrong?

Mario wants to take a bath, but the floor tiles in the bathroom are icy cold. He decides to plug the heater’s power plug into the power point in the passage and then he takes the heater into the bathroom.

Please warn Mario:

Ilze has one power point in her bedroom. She wants to use her heater because it is bitterly cold, but she also wants to use her hairdryer to dry her hair while watching her favourite TV programme.

Please warn Ilze:

Working as a group, take apart a power plug – under the supervision of your educator – to see how the parts fit together. Find out where things go wrong when it does not function.

Select words from the list that is provided to complete the sentences that follow:

( electricity wet fingers power plugs)

  1. Never play with .
  2. See to it that toddlers do not push their into a wall-plug.
  3. Remember that can be very dangerous if they are not used correctly.
  4. Never handle a power plug while your hands are .

Follow the rules for handling electricity safely .

Choose a partner and decide which of the rules you would like to demonstrate practically. Show why you have to be extremely careful when you use electricity by means of role-playing. Do not use electricity for your role-playing – you must act what you want to show

1. Switch off the power before changing a light bulb.

2. Do not use damaged electrical cord.

3. Do not pull on the chord when you want to pull out a plug.

4. Disconnect the plug when an electrical appliance is not in use.

  1. Do not try to repair faulty electrical appliances yourself – call in an electrician.
  2. Do not run an electrical cord underneath a carpet – it could result in a fire.
  3. Do not plug too many power plugs into one contact socket.
  4. Your hands must be dry when you work with any kind of electrical appliance or with electric power.
  5. Never take electrical equipment into the bathroom with you – you may sustain a shock!
  6. Do not touch electrical appliances while you are washing the dishes.
  7. Do not allow small children to play with electrical goods.
  8. Do not leave the cord of an electrical appliance dangling in places where small children might pull down appliances by grabbing the cord.
  9. Stay clear of electricity cables that lie on the ground.
  10. Do not climb up electricity poles.
  11. Do not fly a kite in the vicinity of electricity lines.
  12. Stay clear of electrical substations – it is not a place for games.
  13. Switch off the power supply before removing a plug from the socket.
  14. Do not poke any object into an electric toaster to remove bread.
  15. Switch off the power supply without delay if you notice sparks coming from an electrical appliance and inform your parents of it.
  16. Do not shelter under trees or walk beneath them when there is lightning.

Discuss this with a partner and report your ideas to the class. Here is a design for a bumper sticker. Design some more bumper stickers (one, at least) to illustrate anyone of the above rules. Try to arrange it in such a way that each learner chooses a different rule for his or her design, so that you will have a variety of designs.


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

1.3 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.

LEARNING OUTCOME 3 : SCIENCE, SOCIETY AND THE ENVIRONMENT The 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.


When is electricity dangerous?

  • Mario wants to take a bath, but the floor tiles in the bathroom are very cold and he decides to warm the bathroom a bit. He plugs the heater into a socket in the passage and takes the heater into the bathroom.

Please warn Mario: Electricity and water do not go together! If you are working with water and it comes into contact with electricity, you can electrocute yourself.

  • Ilze has only one power socket in her room. She wants to keep her heater on because it is bitterly cold, but she also wants to dry her hair with the hair drier while watching her favourite television programme.

Please warn Ilze: Too much power from one power socket can cause it to overload and this can lead to a short circuit. You could electrocute yourself by doing this.

Complete the following questions by using the following words:

(electricity wet fingers electrical plugs)

1. Never play with electrical plugs/power sockets .

2. See to it that infants do not put their fingers into a power socket in the wall.

3. Remember that electricity can be very dangerous if it is not used properly.

4. Never touch an electrical plug when your hands are wet .

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
Privacy Information Security Software Version 1.1a
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!

Source:  OpenStax, Natural sciences grade 4. OpenStax CNX. Sep 18, 2009 Download for free at http://cnx.org/content/col11096/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Natural sciences grade 4' conversation and receive update notifications?