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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

can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
Commplementary angles
Idrissa Reply
im all ears I need to learn
right! what he said ⤴⤴⤴
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
Joan Reply
J, combine like terms 7x-4y
Bridget Reply
im not good at math so would this help me
Rachael Reply
I'm not good at math so would you help me
what is the problem that i will help you to self with?
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
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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