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4.5 Elektrisiteit as 'n vorm van hitte

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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

differentiate between demand and supply giving examples
Lambiv Reply
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Lambiv
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Lambiv
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WARKISA
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Lambiv
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Eliyee
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Lindiwe Reply
In economics, a perfect market refers to a theoretical construct where all participants have perfect information, goods are homogenous, there are no barriers to entry or exit, and prices are determined solely by supply and demand. It's an idealized model used for analysis,
Ezea
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Shukri Reply
other things being equal
AI-Robot
When MP₁ becomes negative, TP start to decline. Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 • Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of lab
Kelo
Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 • Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of labour (APL) and marginal product of labour (MPL)
Kelo
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Shukri
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Shukri
what is monopoly mean?
Habtamu Reply
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Shukri Reply
Quantity demanded refers to the specific amount of a good or service that consumers are willing and able to purchase at a give price and within a specific time period. Demand, on the other hand, is a broader concept that encompasses the entire relationship between price and quantity demanded
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Economic growth as an increase in the production and consumption of goods and services within an economy.but Economic development as a broader concept that encompasses not only economic growth but also social & human well being.
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Jabir
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Awais Reply
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Asui
it is a curve that we get after connecting the pareto optimal combinations of two consumers after their mutually beneficial trade offs
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In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities, where neither p
Cornelius
In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities,
Cornelius
Suppose a consumer consuming two commodities X and Y has The following utility function u=X0.4 Y0.6. If the price of the X and Y are 2 and 3 respectively and income Constraint is birr 50. A,Calculate quantities of x and y which maximize utility. B,Calculate value of Lagrange multiplier. C,Calculate quantities of X and Y consumed with a given price. D,alculate optimum level of output .
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Answer
Feyisa
c
Jabir
the market for lemon has 10 potential consumers, each having an individual demand curve p=101-10Qi, where p is price in dollar's per cup and Qi is the number of cups demanded per week by the i th consumer.Find the market demand curve using algebra. Draw an individual demand curve and the market dema
Gsbwnw Reply
suppose the production function is given by ( L, K)=L¼K¾.assuming capital is fixed find APL and MPL. consider the following short run production function:Q=6L²-0.4L³ a) find the value of L that maximizes output b)find the value of L that maximizes marginal product
Abdureman
types of unemployment
Yomi Reply
What is the difference between perfect competition and monopolistic competition?
Mohammed
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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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