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Natuurwetenskappe

Graad 5

Energie en verandering

Module 35

Energie as 'n bron van hitte

Aktiwiteit 1:

Om energie as bron van hitte te kan bespreek

[lu 1.3.1; 2.1]

Kom ons kyk hoe ons van direkte sonlig kan gebruik maak.

  • As 'n eerste stap kan jy gerus 'n klein oefening doen om die KRAG van sonlig (die hoeveelheid energie wat dit bevat) te bepaal.

Gebruik 'n vergrootglas en brand jou naam op 'n stuk papier uit.

Beskryf wat gebeur (gebruik die woorde sonligenergie, konsentreer, hitte, brand):

Hoekom moet leë glasbottels nie in die veld gegooi word nie?

Aktiwiteit 2:

Om die gebruik van sonligenergie vir waterverwarming deur middel van sonpanele te kan bespreek

[lu 3.1.1]

Hierdie sonpanele vang sonligenergie op. Op hierdie eenvoudige manier kan 'n huis van warm water voorsien word sonder die gebruik van elektrisiteit. Die panele bestaan uit lang pype wat teen mekaar gevou lê om die oppervlak wat bestraal word soveel moontlik te vergroot. Die pype is gekoppel aan die waterstelsel in die huis.

Ongelukkig skyn die son egter nie dag en nag nie en in sekere seisoene, byvoorbeeld winter, is die hitte van die son onvoldoende. Ons moet dus planne beraam om ook van ander bronne gebruik te maak.

Aktiwiteit 3:

Om die gebruik van gestoorde energie vir verwarming te kan bespreek

[lu 3.1.1]

Die mees algemene manier van hitteverskaffing vir verwarming was in die verlede om 'n stof te verbrand sodat die gestoorde energie as warmte of hitte vrygestel word.

Hout word veral in landelike gemeenskappe steeds algemeen gebruik. Oop vure en vure in kaggels of konkas verskaf aan baie mense warmte in die winter. Suid-Afrikaners is ook bekend vir hul liefde vir braaivleis.

Ongelukkig gebruik mense dikwels waardevolle hout wat hulle in die veld versamel. Hierdie hout behoort te verweer sodat die bestanddele daarvan weer in die grond beland waar die boom dit oorspronklik gekry het om te kon groei. As die hout egter opgetel en verbrand word, verarm die grond en kan daar uiteindelik nie meer plante groei nie. Dit lei daartoe dat die balans van die natuur versteur word en afwykings soos aardverhitting ontstaan.

Gelukkig gebruik mense egter dikwels hout van bome wat as plantasies aangeplant is.

Steenkool word steeds in sekere outydse stowe en kaggels verbrand om hitte vir verwarming of kookdoeleindes te verkry. Interessant om te dink dat dit eintlik sonligenergie van miljoene jare gelede is wat dan verbrand word!

Paraffien word nog algemeen deur mense in afgeleë gebiede gebruik. In sulke gebiede is daar dikwels nog nie elektrisiteit nie en maak die mense gebruik van 'n primus. Paraffien word in die toestel verbrand om energie vry te stel wat die kos laat gaar word.

Beskryf in vyf sinne hoe die mense se metodes om gestoorde energie deur verbranding vry te stel, met verloop van tyd verbeter het.

Aktiwiteit 4:

Om die gebruik van wrywing vir die verskaffing van energie te kan bespreek

[lu 1.1.1; 3.1.1]

  • Wrywing kan ook gebruik word om gestoorde energie in die vorm van hitte vry te stel.

Vryf jou hande vinnig en hard teen mekaar. Wat voel jy?

Questions & Answers

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
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Natuurwetenskappe graad 5. OpenStax CNX. Sep 23, 2009 Download for free at http://cnx.org/content/col10980/1.2
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