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Natuurwetenskappe

Energie-oordrag en kragte

Opvoeders afdeling

Memorandum

(i) Yskas; ketel; rooster

(ii) Konveksieverwarmer; waaiverwarmer; yster

(iii) Yskas; ketel; stofsuier of rooster

(iv) Menger; konveksieverwarmer; waaierverwarmer; filtreerkan

Bv. Verwarmers kan vervang word deur isolerende plafonne, matte of sementvloere, digsluitende ruite, ens.

Leerder afdeling

Inhoud

Aktiwiteit: om die energieverbruik van verskeie elektriese toestelle te vergelyk [lu 3.2]

a. Bestudeer die volgende en beantwoord dan die daaropvolgende vrae:

Met slegs een eenheid elektrisiteit _________________________________________

Hierdie kaart dui die bedryfskoste van sommige huishoudelike toestelle aan volgens hulle verbruik per eenheid elektrisiteit.

(i) Watter drie toestelle is volgens hierdie kaart die goedkoopste?

_____________________________________________________________________

(ii) Watter drie toestelle is die duurste om aan te hou?

_____________________________________________________________________

(iii) Watter toestelle word die meeste in huishoudings gebruik?

_____________________________________________________________________

(iv) Watter toestelle sou jy sê is onnodig en kan vervang word deur iets wat nie so baie brandstof gebruik nie of kan heeltemal uitgeskakel word? Dui aan waardeur dit vervang kan word.

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

______________________________________________________________

______________________________________________________________

______________________________________________________________

______________________________________________________________

(b) Baie mense in Suid-Afrika het egter nog nie toegang tot elektrisiteit nie en gebruik brandhout, paraffien of gas as brandstowwe om kos te kook en huise warm te hou. Die brandstowwe (veral hout) word skaarser en mense moet ver loop om genoeg brandhout bymekaar te kry. Dit is dus uiters noodsaaklik dat ook hierdie brandstowwe doeltreffend gebruik word ten einde besparing teweeg te bring.

Baie van hierdie mense maak gebruik van ‘n oop vuurmaakplek en dan word baie van die hitte-energie na die lug rondom oorgedra. Mense gebruik ook ‘n gasstofie verkeerd en soms word daar baie energie vermors.

GROEPWERK

Elke groep kies ‘n kooktoestel wat deur die meerderheid Suid-Afrikaners in veral plattelandse gebiede gebruik word, bv. oop vuur; gasstofie, ens. Hierdie toestel moet prakties voorgestel word deur middel van ‘n model en daarna moet ‘n kort verslaggie daaroor geskryf word. In die verslag moet die volgende vrae beantwoord word.

  • Watter brandstof word gebruik?
  • Is dit maklik bekombaar vir die mense?
  • Watter kleur pot word aanbeveel? Hoekom?
  • Watter voorsorg moet getref word sodat daar nie te veel hitte-energie verby die pot beweeg en in die lug verlore gaan nie?
  • Wat is die koste van die brandstof?

Leerkragassessering

Kriteria 1 2 3 4
Opdrag: Korrek uitgevoer; volledig; saaklik; betyds ingehandig
Model: Effektief; brandstof aangedui; kreatiewe voorstelling
Verslag: Alle vrae aangespreek; verslagdoening netjies; goeie taalgebruik
Samewerking in groep: Effektief; oplos van onderlinge geskille; alle lede betrokke
OORHEERSENDE KODE

Assessering

Leeruitkomste 3: Die leerder is in staat om begrip van die onderlinge verband tussen wetenskap en tegnologie, die samelewing en die omgewing te toon .

Assesseringstandaard 3.2: Dit is duidelik wanneer die leerder die volhoubare gebruik van die aarde se hulpbronne verstaan: ontleed inligting oor volhoubare en nie-volhoubare gebruik van hulpbronne.

Questions & Answers

how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
what is cell
faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
what are emergency diseases
Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
Heyy Lubega hussein where are u from?
_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
How can Commensal can Bacteria change into pathogen?
Sadik
How can Commensal Bacteria change into pathogen?
Sadik
all
Tesfaye
by fussion
Asiina
what are the advantages of normal Flora to the host
Micheal
what are the ways of control and prevention of nosocomial infection in the hospital
Micheal
what is inflammation
Shelly Reply
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Micheal Reply
Binomial nomenclature
adeolu
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Source:  OpenStax, Natuurwetenskappe graad 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11078/1.1
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