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Wat is elektrisiteit?

Module by: Siyavula Uploaders. E-mail the author

TEGNOLOGIE

Graad 7

STELSELS EN BEHEER: ELEKTRISITEIT

Module 10

WAT IS ELEKTRISITEIT?

Elektrisiteit

Agtergrond

Elektrisiteit is ‘n vorm van energie. ‘n Voorwerp wat die vermoë het om elektrisiteit te gelei, besit elektriese energie. Elektrisiteit word in Volt gemeet.

Elektriese energie kan maklik in ‘n ander vorm van energie omgesit word.

Daar is hoofsaaklik twee tipes elektrisiteit, naamlik

  • hoofstroomelektrisiteit
  • battery-elektrisiteit

Battery-elektrisiteit

Die elektriese energie word in ‘n battery gestoor. Daar word die energie chemiese energie genoem. Wanneer elektriese energie vloei, beweeg elektrone in ‘n elektriese stroombaan.

Die basiese elemente vir ‘n elektriese stroombaan is:

  • ‘n energiebron, bv. ‘n battery (‘n sel is 1,5V groot);

Figure 1
Figure 1 (Picture 4.png)

Skets

Figure 2
Figure 2 (Picture 5.png)

Simbool

  • ‘n geleier, nl. drade van ‘n metaal wat die stroom gelei;
Figure 3
Figure 3 (Picture 7.png)

Skets

Figure 4
Figure 4 (Picture 8.png)

Simbool

  • ‘n skakelaar wat ‘n oop of geslote stroombaan kan veroorsaak;

Figure 5
Figure 5 (Picture 10.png)

Skets

Figure 6
Figure 6 (Picture 11.png)

Simbool

  • ‘n lading in die vorm van ‘n lig-, klank-, beweging- of warmtebron;

Figure 7
Figure 7 (Picture 13.png)

‘n Lig

Figure 8
Figure 8 (Picture 14.png)

Simbool

Figure 9
Figure 9 (Picture 15.png)

‘n Gonser

Figure 10
Figure 10 (Picture 16.png)

Simbool

Figure 11
Figure 11 (Picture 17.png)

‘n Elektriese motor

Figure 12
Figure 12 (Picture 18.png)

Simbool

Twee of meer van dieselfde komponente van ‘n stroombaan kan op twee verskillende maniere in ‘n stroombaan gemonteer word, nl.

  • in serie,bv. ‘n positiewe pool van ‘n sel word met ‘n negatiewe pool van ‘n ander sel verbind;
  • in parallel, bv. al die positiewe pole van twee of meer selle van ‘n battery word met mekaar verbind en al die negatiewe pole van twee of meer selle van ‘n battery word met mekaar verbind.

Voordeel van selle in serie – ‘n sterker stroom word gelewer.

Voordeel van selle in parallel – dieselfde stroom kan langer gelewer word.

Wenk aan onderwyser:

Hierdie werkkaarte kan in groepe gedoen word. Elke groep kan ‘n ander stroombaan bou en dit dan aan die klas demonstreer, waarna elke leerder individueel die werkkaarte kan voltooi. Elke groep kan eers ‘n toetsstroombaan met ‘n I,5 V-gloeilamp in ‘n gloeilamphouer, ‘n skakelaar, draad en ‘n 1,5 V-sel in ‘n selhouer op ‘n sagtebordbasis bou. Monteer eers die gloeilamphouer, die batteryhouer en die skakelaar. Verbind die komponente met die draad en plaas die battery en gloeilamp in die stroombaan.

Benodigdhede (materiaal en gereedskap) :

  • 1,5 V-selle
  • selhouers
  • 1,5 V-gloeilampies
  • gloeilamphouers
  • 7 skakelaars
  • 7 basisse van sagtebord, 150 mm by 150 mm
  • draad om komponente te verbind
  • skroefies om komponente op sagtebord te monteer
  • verbindings
  • skroewedraaiers (platbek- en ster-)
  • gonsers met ‘n lae volt
  • resistors en diodes

Opdrag 1:

Om ‘n ondersoek uit te voer d.m.v. ‘n eenvoudige:

praktiese toets [LU 1.3]

Om toepaslike data te verkry [LU 1.4.4]

Om die stelsel te evalueer [LU 1.12]

Om kennis en begrip van elektriese stroombane te toon [LU 2.2]

WERKKAART 1:

  • Verbind een 1,5 V-gloeilamp in ‘n gloeilamphouer met ‘n sel in ‘n selhouer. Gebruik verbindingsdraad en monteer ook ‘n skakelaar.
  • Maak ‘n eenvoudige skets van die stroombaan.

1.3 Teken ‘n stroomdiagram van die stroombaan en gebruik die regte simbole.

1.4 Onderstreep:

Die gloeilamp brand (baie helder/ helder/ dof/ glad nie).

WERKKAART 2:

2.1 Verbind een 1,5 V-sel in ‘n selhouer met twee 1,5 V-gloeilampe in gloeilamphouers. Monteer die gloeilampe in parallel. Voeg ook ‘n skakelaar in die stroombaan en verbind die komponente met geleidingsdrade.

  • Teken ‘n stroomdiagram van die stroombaan.
  • Verwyder een van die gloeilampe uit sy houer. Wat gebeur met die ander gloeilamp? Verduidelik waarom dit gebeur.
  • Onderstreep:

Die gloeilampe brand (baie helder/ helder/ dof/ glad nie).

WERKKAART 3:

3.1 Verbind een 1,5 V-sel met twee 1,5 V-gloeilampe in serie. Monteer eers die selhouer, skakelaar en gloeilamphouers en verbind die komponente met die geleidingsdraad. Plaas daarna die sel en gloeilampe in die stroombaan.

3.2 Teken ‘n stroomdiagram van die stroombaan.

  • Verwyder een van die gloeilampe uit sy houer. Wat gebeur met die ander gloeilamp? Verduidelik waarom dit gebeur. 3.4 Onderstreep:

Die gloeilampe brand (baie helder/ helder/ dof/ glad nie).

WERKKAART 4:

4.1 Verbind twee 1,5 V-selle in serie met twee 1,5 V-gloeilampe wat parallel verbind is.

4.2 Teken ‘n stroomdiagram van die stroombaan.

  • Onderstreep:

Die gloeilampe brand (baie helder/ helder/ dof/ glad nie).

4.4 Onderstreep:

Die invloed van twee selle in parallel op die sterkte van die stroom is (groot/ gering).

WERKKAART 5:

5.1 Verbind twee 1,5 V-selle in serie met twee 1,5 V-gloeilampe wat parallel verbind is.

5.2 Teken ‘n stroomdiagram van die stroombaan.

5.3 Onderstreep:

Die gloeilampe brand (baie helder/ helder/ dof/ gladnie).

5.4 Onderstreep:

Die invloed van twee selle in serie op die grootte van die stroom is (groot/ gering).

WERKKAART 6:

6.1 Verbind twee 1,5 V-selle in serie met ‘n gonser en een 1,5 V-gloeilamp in serie.

6.2 Teken ‘n stroomdiagram van die stroombaan.

6.3 Werk die stroombaan? Hoekom of hoekom nie? Verskaf redes vir jou antwoord.

WERKKAART 7:

7.1 Verbind twee 1,5 V-selle in serie met ‘n gonser en een 1,5V-gloeilamp wat parallel met mekaar verbind is.

7.2 Teken ‘n stroomdiagram van die stroombaan.

7.3 Werk die stroombaan? Hoekom of hoekom nie? Verskaf redes vir jou antwoord.

WERKKAART 8:

  • Wat beteken dit as twee gloeilampe in parallel verbind is?
  • Wat beteken dit as twee gloeilampe in serie verbind is?
  • Wat is die voordele om gloeilampe in parallel te verbind?
  • Wat is die voordele om selle / batterye in parallel te verbind?
  • Wat is die voordele om selle / batterye in serie te verbind?
  • Wat is die funksie van ‘n weerstand in ‘n stroombaan?
  • Onderstreep:‘n Weerstand word in (serie / parallel) met ‘n gloeilamp of gonser in ‘n stroombaan ingebou.
  • Wat is die funksie van ‘n diode in ‘n stroombaan?

8.7.2 Onderstreep:

‘n Diode word in (serie / parallel) met ander komponente in ‘n stroombaan ingebou.

Assessering

Table 1
Leeruitkomstes(LUs)
 
LU 1
Tegnologiese Prosesse en VaardighedeDie leerder is in staat om tegnologiese prosesse en vaardighede eties en verantwoordelik toe te pas deur gepaste inligtings- en kommunikasietegnologie te gebruik.
Assesseringstandaarde(ASe)
 
Dit is duidelik wanneer die leerder:
ondersoek:
1.3 ondersoek uitvoer deur middel van eenvoudige praktiese toetse met betrekking tot aspekte van die tegnologiese kennisvelde (Strukture, Verwerking, Stelsels en Beheer);
1.4 tydens ondersoeke ‘n strategie beplan vir die versameling van data en inligting.
  • die produk of stelsel evalueer gebaseer op kriteria wat direk met die ontwerpopdrag en sommige van die spesifikasies en beperkings verband hou, en verbeteringe of wysigings voorstel;
LU 2
TEGNOLOGIESE KENNIS EN BEGRIP Die leerder is in staat om relevante tegnologiese kennis te verstaan en dit eties en verantwoordelik toe te pas.
Dit is duidelik wanneer die leerder:
verwerking:2.2 kennis en begrip toon van hoe stowwe/materiaal verwerk kan word om eienskappe te verander of te verbeter (bv. sterkte, brandbestandheid, waterdigtheid, smaak, volume, tekstuur).

Memorandum

Opdrag 1

Werkkaart 1:

1.2 Soos die leerder dit sou sien.

Figure 13
Figure 13 (graphics1.png)

1.3

Werkkaart 2:

Figure 14
Figure 14 (graphics2.png)
2.2

2.3 Waterwiel/hystoestel

  • Brand nog steeds
  • Elektriese stroom vloei nog deur

2.4 dof

Werkkaart 3:

Figure 15
Figure 15 (graphics3.png)
3.2

3.3 Waterwiel/hystoestel

  • Brand nie
  • Stroom is onderbreek
  • glad nie

Werkkaart 4:

Figure 16
Figure 16 (graphics4.png)
4.2

4.3 helder

4.4 gering

Werkkaart 5:

Figure 17
Figure 17 (graphics5.png)
5.2

5.3 baie helder

5.4 groot

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