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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

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
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
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
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
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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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