<< Chapter < Page Chapter >> Page >

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

the diagram of the digestive system
Assiatu Reply
How does twins formed
William Reply
They formed in two ways first when one sperm and one egg are splited by mitosis or two sperm and two eggs join together
Oluwatobi
what is genetics
Josephine Reply
Genetics is the study of heredity
Misack
how does twins formed?
Misack
What is manual
Hassan Reply
discuss biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles
Joseph Reply
what is biology
Yousuf Reply
the study of living organisms and their interactions with one another and their environments
AI-Robot
the study of living organisms and their interactions with one another and their environment.
Wine
discuss the biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles in an essay form
Joseph Reply
what is the blood cells
Shaker Reply
list any five characteristics of the blood cells
Shaker
lack electricity and its more savely than electronic microscope because its naturally by using of light
Abdullahi Reply
advantage of electronic microscope is easily and clearly while disadvantage is dangerous because its electronic. advantage of light microscope is savely and naturally by sun while disadvantage is not easily,means its not sharp and not clear
Abdullahi
cell theory state that every organisms composed of one or more cell,cell is the basic unit of life
Abdullahi
is like gone fail us
DENG
cells is the basic structure and functions of all living things
Ramadan
What is classification
ISCONT Reply
is organisms that are similar into groups called tara
Yamosa
in what situation (s) would be the use of a scanning electron microscope be ideal and why?
Kenna Reply
A scanning electron microscope (SEM) is ideal for situations requiring high-resolution imaging of surfaces. It is commonly used in materials science, biology, and geology to examine the topography and composition of samples at a nanoscale level. SEM is particularly useful for studying fine details,
Hilary
cell is the building block of life.
Condoleezza Reply
what is cell divisoin?
Aron Reply
Diversity of living thing
ISCONT
what is cell division
Aron Reply
Cell division is the process by which a single cell divides into two or more daughter cells. It is a fundamental process in all living organisms and is essential for growth, development, and reproduction. Cell division can occur through either mitosis or meiosis.
AI-Robot
What is life?
Allison Reply
life is defined as any system capable of performing functions such as eating, metabolizing,excreting,breathing,moving,Growing,reproducing,and responding to external stimuli.
Mohamed
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




Source:  OpenStax, Natuurwetenskappe graad 5. OpenStax CNX. Sep 23, 2009 Download for free at http://cnx.org/content/col10980/1.2
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Natuurwetenskappe graad 5' conversation and receive update notifications?

Ask