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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

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Tegnologie graad 6. OpenStax CNX. Sep 07, 2009 Download for free at http://cnx.org/content/col11004/1.1
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