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Natuurwetenskappe

Graad 5

Energie en verandering

Module 35

Elektrisiteit as 'n vorm van energie

Aktiwiteit 1:

Om elektrisiteit as 'n vorm van energie te kan bespreek

[lu 1.1.1; 1.2.1; 2.1; 3.1]

Die belangrikheid van elektrisiteit

In ons moderne samelewing is 'n lewe sonder elektrisiteit ondenkbaar.

Maak gerus 'n lys van aktiwiteite waarvoor jy of jou gesin daagliks elektrisiteit gebruik.

Almal sal waarskynlik die gebruik van lig op hulle lys hê. Kom ons kyk 'n bietjie na die gloeilampie wat ons almal so goed ken.

  • Die gloeilampie is 'n goeie voorbeeld van 'n uitvindsel wat die mens se lewenswyse drasties verander het. Dit is ongeveer 100 jaar gelede deur 'n persoon met die naam Thomas Alva Edison ontwerp.

Bring 'n gloeilampie skool toe om jou met die onderstaande taak te help.

  • As jy na 'n elektriese gloeilamp kyk, sal jy sien dat dit die dun draadjie of filament is wat gloei en die lig afgee. Die filament word van tungsten gemaak. Tungsten is 'n metaal wat nie maklik smelt wanneer dit warm word en gloei nie. Die gloeilamp bevat geen lug nie, maar wel 'n onskadelike gas, argon, wat verhoed dat die filament uitbrand.

Die tungstendraad moet baie lank en dun wees om so helder te kan gloei. Om hierdie lengte draad in 'n gloeilamp te pas, word dit dikwels in 'n draadklos opgerol. Hierdie klos word deur 'n stel ander drade gedra.

Die krag of sterkte van die gloeilamp word op die gloeilamp aangedui. Dit word in 'watt' gegee, bv. in huishoudelike gloeilampe 40W (flouste), 60W (algemeenste), 75W, 100W of 150W (sterkste).

Kyk nou na die gloeilamp wat jy saamgebring het.

  1. Die gloeilamp is ______ watt. Wat vertel dit jou?
  2. Hoe pas jou gloeilamp in die houer?
  3. Kyk na die smalste deel van die gloeilamp. By watter deel dring die krag die

gloeilamp binne?

  1. Waarvan is hierdie gedeelte gemaak?
  2. Waarom dink jy is die stutdrade deur middel van 'n glasstut van mekaar geskei?
  3. Die tungstenfilament is op 'n sekere manier gevorm en deur drade gesteun. Waarom?
  4. Skets jou gloeilamp en voorsien dit van die nodige byskrifte.

Die opwekking van elektrisiteit

Onthou dat ons elektrisiteit gebruik om ENERGIE te verkry.

Die voordeel van elektrisiteit is dat dit ons minder afhanklik van brandstowwe in die natuur maak. Hierdie brandstowwe is besig om vinnig uitgeput te raak. Kom ons kyk na 'n paar maniere waarop elektrisiteit opgewek kan word.

  • Die dinamo

'n Dinamo kan as 'n kragopwekker vir byvoorbeeld 'n fietsryer dien sodat hy sy roete in die aand kan verlig. Doen navorsing en verduidelik kortliks hoe hierdie dinamo werk. Onthou om te sê waar die energie vandaan kom.

  • Opwekking van elektrisiteit met behulp van waterstrome

'n Hidroëlektriese kragsentrale maak gebruik van bewegende water vir die opwekking van elektrisiteit. Die water word met pype gelei om turbines te laat draai. Die turbine laat kragopwekkers (amper soos die dinamo van die fiets) draai. Hoe groter die druk of krag van die water wat deur die pype vloei, hoe meer krag word opgewek. Daar word dus seker gemaak dat daar genoeg water opdam deur middel van damwalle in riviere. Water gaar agter die damwal op.

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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