<< Chapter < Page Chapter >> Page >

Tegnologie

Graad 6

Stelsels en beheer: ‘n elektriese skok

Module 12

Ontdek energie

Agtergrond

Raai-raai? Wat noem ons die vermoë om te werk? Wat kan nooit geskep of vernietig word nie? Wat kan slegs van een vorm na ‘n ander oorgedra word? Dis reg!

E _______________

Die vernaamste bron van energie in die natuur is die son , deurdat dit hitte en ligenergie uitstraal. Plante gebruik hierdie lig- en warmte-energie en verander dit in chemiese energie wat hulle gebruik om te groei.

Die mens en diere benodig ook energie vir alles wat hulle doen. Ons kry ons energie deur kos te eet. Die chemiese energie wat in die kos vasgevang is, word in ons liggame verander in kinetiese (bewegings-) energie wat die spiere in ons liggame in staat stel om hul werk te verrig.

Alle voedsel wat ons eet, bevat dus energie in ‘n mindere of meerdere mate. In watter eenheid word die hoeveelheid energie wat in voedsel teenwoordig is, gemeet?

Opdrag 1

Bestudeer die etikette op blikkies of pakkies voedsel. Voltooi die volgende tabel om die energiewaarde van verskillende voedselsoorte te bepaal.

VOEDSEL HOEV. VOEDSEL, bv. 100g KILOJOULES per 100g
LU/AS 2.4

Opdrag 2

Watter voedselsoorte bevat die meeste kilojoules per 10 g/ml?

Gevolgtrekking

Voedselsoorte soos vette, olies, proteïne, suiker en stysel kan energie aan jou liggaam verskaf. Suiker en stysels (koolhidrate) verskaf meer en vinniger energie aan jou liggaam. As jy nie genoeg oefening kry nie en dus nie van hierdie energie ontslae raak nie, word die energie in die vorm van vet in jou liggaam gestoor.

LU/AS 2.4

Opdrag 3

Waarom eet ‘n atleet wat aan byvoorbeeld ‘n marathon soos die Comrades deelneem, pasta voor die marathon?

LU/AS 2.4

Voedsel gee vir ons energie om werk te kan verrig. Net so het masjiene ook energie nodig om te werk.

Daar is baie verskillende soorte energie, naamlik:

Chemiese energie ‘n Voorwerp het die vermoë om energie te toon as gevolg van sy chemiese samestelling.
Potensiële energie Enige voorwerp wat nie op die aarde se oppervlak is nie, het die potensiaal om weer na die aarde toe terug te val as gevolg van die aarde se aantrekkingskrag.
Kinetiese energie (bewegings) Die energie wat ‘n bewegende voorwerp het.
Warmte-energie Die vermoë van ‘n voorwerp om warmte uit te straal.
Lig-energie Die vermoë van ‘n voorwerp om lig uit te straal.
Elektriese energie Die vermoë van ’n voorwerp om elektrisiteit te gelei.
Klank-energie Die vermoë van ‘n voorwerp om klank voort te bring.

Daar vind gedurig oordrag van energie plaas binne ‘n voorwerp. Ons noem dit energie-omsetting.

Opdrag 4

Noem ‘n voorbeeld waar die volgende energie-omsetting plaasvind. Kies uit die volgende moontlikhede (‘n stoof, ‘n hoëtroustel, ‘n gloeilamp, ‘n bal aan ‘n rek, ‘n elektriese trein, ‘n motorbattery).

  1. elektriese energie na klank-energie
  2. elektriese energie na warmte-energie
  3. potensiële energie na kinetiese energie
  4. elektriese energie na lig-energie
  5. elektriese energie na kinetiese energie
  6. chemiese energie na elektriese energie
LU/AS 2.4

In hierdie module gaan ons spesifiek kyk na elektriese energie. Elektrisiteit is baie nuttig, want dit is ‘n tipe energie wat maklik omgesit kan word in ander vorms van energie. Dit besoedel of beskadig nie die omgewing nie en kan veilig en maklik gestoor word.

Questions & Answers

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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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
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
Good
Berger describes sociologists as concerned with
Mueller Reply
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, Tegnologie graad 6. OpenStax CNX. Sep 07, 2009 Download for free at http://cnx.org/content/col11004/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Tegnologie graad 6' conversation and receive update notifications?

Ask