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Natuurwetenskappe

Energie-oordrag en stelsel

Bronne van energie en energiesisteme

Opvoeders afdeling

Memorandum

Staties:

  • Winkeltrollies het ‘n kettinkie wat op grond sleep. Ladings vloei in die grond in.
  • Ontstaan wanneer iets vryf en daar weerstand is, bv. hande op ‘n handvatsel, klere op sitplek, ens.

Weerlig:

Enige voorbeelde, bv.

  • Moenie voor oop deure en vensters staan nie.
  • Dra skoene met rubbersole.
  • Bly weg van draadheinings.
  • Lê plat, moet nooit regop staan of op ‘n voorwerp staan nie.
  • Installeer weerligafleiers.

Moenie oor die telefoon praat as daar donderweer is nie.

Leerder afdeling

Inhoud

  • Die natuurlike energiebronne soos die son, wind en water wat reeds behandel is, voorsien net gedeeltelik in die energiebehoeftes van die mens. Daar is oor die afgelope jare min aandag gegee aan die ontginning van hierdie energiebronne, juis omdat dit moeilik is om hierdie energiebronne op te vang, te berg en te beheer. Die volgende hulpbronne word hoofsaaklik gebruik om in die mens se energiebehoeftes te voorsien.

Kernkrag is die nuutste en gevaarlikste tipe brandstof beskikbaar.

Vervolgens gaan ons na die bronne van elektriese energie kyk. Ons let veral op die volgende:

Statiese elektrisiteit en weerlig

Selle

Batterye

Dinamo’s

Steenkoolaangedrewe kragstasies

Kernkrag

Jy het in Graad 5 reeds met sommige van hierdie bronne kennis gemaak. Hierdie jaar kyk ons in meer besonderhede daarna. Ons gaan jou ook help om te verstaan wat energiesisteme is en hoe sommige van die bronne as sisteme beskryf kan word.

Onthou intussen die volgende definisie vir 'n sisteem:

'n Sisteem bestaan uit twee of meer dele wat saamwerk of mekaar beïnvloed.

Aktiwiteit: om statiese elektrisiteit en weerlig as bronne van energie te kan beskryf [lu 2.3]

  • Statiese elektrisiteit

Ons het reeds geleer dat statiese elektrisiteit altyd in die lug rondom ons teenwoordig is. Statiese elektrisiteit is nie baie sterk nie, maar ons kan dit d.m.v. wrywing sterker maak.

Statiese elektrisiteit kan ons ook soms ‘n onaangename skok gee. Metaaltrollies by winkels is so gemaak dat hulle die statiese elektrisiteit wat in hulle opbou, na elders gelei.

  • Bespreek die manier van geleiding in jul groepe.

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  • Hoe ontstaan statiese elektrisiteit?

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  • WEERLIG

Julle het reeds geleer dat alle materiale uit klein deeltjies bestaan. Sulke deeltjies is soms met elektrisiteit gelaai. Deeltjies kan óf positief óf negatief gelaai wees. Elektrisiteit kan opgewek word as negatief gelaaide deeltjies van een plek na ‘n ander beweeg. Partymaal kan die vloei van elektrisiteit as ‘n vonk waargeneem word. Weerlig is ‘n groot hoeveelheid elektrisiteit wat as ‘n vonk in die lug gesien kan word. ‘n Mens kan sê dat weerlig veroorsaak word as groot hoeveelhede negatief gelaaide deeltjies van een wolk na ‘n ander of van 'n wolk af grond toe beweeg.

  • Skryf ‘n paar voorsorgmaatreëls neer wat ons moet nakom as daar ‘n donderstorm is.

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Assessering

Leeruitkomste 2: Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.

Assesseringstandaard 2.3: Dit is duidelik wanneer die leerder inligting interpreteer.

Questions & Answers

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
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
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 6. OpenStax CNX. Sep 17, 2009 Download for free at http://cnx.org/content/col11080/1.1
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