<< Chapter < Page Chapter >> Page >

Natuurwetenskappe

Energie-oordrag en kragte

Opvoeders afdeling

Memorandum

3. Flitslig van kamera - battery

4. Paraffienverwarmer paraffien

5. Gasverwarmer - gas

6. Haardroër - elektrisiteit

7. Windmeul - wind, ens.

Leerder afdeling

Inhoud

Aktiwiteit: om die energiebronne van alledaagse items te identifiseer [lu 1.2]

Dink aan items in julle huise en aan dinge wat beweeg, en doen dan die volgende saam met ‘n maat. Probeer om die lys te voltooi:

ITEM BRON VAN ENERGIE
motor petrol / diesel
trein elektrisiteit / steenkool
_______________________________ _______________________________
_______________________________ _______________________________
_______________________________ _______________________________
_______________________________ _______________________________
_______________________________ _______________________________

3. Brandstowwe

Die plante en diere wat miljoene jare gelede gelewe het, het die son se energie geabsorbeer terwyl hulle gegroei het. Hulle is begrawe onder rotslae wat mettertyd oor hulle gevorm het. Hulle oorblyfsels is geleidelik deur verskillende chemiese reaksies in olie, steenkool en gasse verander. Ons noem hierdie brandstowwe fossielbrandstowwe . Olie, steenkool en gasse is nie-hernubaar , d.w.s. hulle kan nie vervang word nie. Daarbenewens moet hulle uit ondergrondse reserwes gemyn word en hul verbranding doen skade aan ons omgewing en ons gesondheid. Een nie-hernubare energiebron wat nie ‘n fossielbrandstof is nie, is kernkrag . Sekere metale soos uraan ondergaan ‘n proses wat ons kernsplitsing noem en stel dan groot hoeveelhede energie vry. Kernkrag word bv. by die kernkragstasie by Koeberg gebruik om elektrisiteit op te wek wat deur die inwoners van Kaapstad gebruik word. ‘n Klein hoeveelheid kernkrag lewer groot hoeveelhede kernbrandstof en veroorsaak baie min omgewingsbesoedeling. Daar is ook tans groot hoeveelhede kernbrandstof beskikbaar. Kernkragsentrales moet naby die kus gebou word as gevolg van die behoefte aan waterverkoeling. Dit bring mee dat die energie soms oor lang afstande vervoer moet word. Radioaktiewe bestraling kan lei tot gesondheidsgevare en dit neem honderde jare voordat radioaktiewe kernafvalprodukte nie meer radioaktief is nie en moet dus vir baie jare in spesiale houers ondergronds geberg word. Kernkrag veroorsaak egter nie suurreën of die kweekhuiseffek soos fossielbrandstowwe nie.

Omdat hierdie nie-hernubare brandstowwe nie meer vir baie lank beskikbaar gaan wees nie, moet ons energie bespaar en van alternatiewe energiebronne soos die son, water, wind, golwe, getye en biogasse begin gebruik maak vir ons krag. Groot vordering is reeds op hierdie gebied gemaak.

Assessering

Leeruitkomste 1: Die leerder is in staat om met selfvertroue op weetgierigheid oor natuurlike verskynsels te reageer, en om binne die konteks van wetenskap, tegnologie en die omgewing verbande te ondersoek en probleme op te los.

Assesseringstandaard 1.2: Dit is duidelik wanneer die leerder ondersoeke uitvoer en data versamel: organiseer en gebruik toerusting of bronne om inligting in te versamel en aan te teken

Questions & Answers

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
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
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
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, Natuurwetenskappe graad 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11078/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Natuurwetenskappe graad 7' conversation and receive update notifications?

Ask