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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);

Skets

Simbool

  • ‘n geleier , nl. drade van ‘n metaal wat die stroom gelei;

Skets

Simbool

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

Skets

Simbool

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

‘n Lig

Simbool

‘n Gonser

Simbool

‘n Elektriese motor

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 paralle l, 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.

Questions & Answers

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
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
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
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor 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, Tegnologie graad 7. OpenStax CNX. Sep 10, 2009 Download for free at http://cnx.org/content/col11031/1.1
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