<< Chapter < Page Chapter >> Page >

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

Discuss the differences between taste and flavor, including how other sensory inputs contribute to our  perception of flavor.
John Reply
taste refers to your understanding of the flavor . while flavor one The other hand is refers to sort of just a blend things.
Faith
While taste primarily relies on our taste buds, flavor involves a complex interplay between taste and aroma
Kamara
which drugs can we use for ulcers
Ummi Reply
omeprazole
Kamara
what
Renee
what is this
Renee
is a drug
Kamara
of anti-ulcer
Kamara
Omeprazole Cimetidine / Tagament For the complicated once ulcer - kit
Patrick
what is the function of lymphatic system
Nency Reply
Not really sure
Eli
to drain extracellular fluid all over the body.
asegid
The lymphatic system plays several crucial roles in the human body, functioning as a key component of the immune system and contributing to the maintenance of fluid balance. Its main functions include: 1. Immune Response: The lymphatic system produces and transports lymphocytes, which are a type of
asegid
to transport fluids fats proteins and lymphocytes to the blood stream as lymph
Adama
what is anatomy
Oyindarmola Reply
Anatomy is the identification and description of the structures of living things
Kamara
what's the difference between anatomy and physiology
Oyerinde Reply
Anatomy is the study of the structure of the body, while physiology is the study of the function of the body. Anatomy looks at the body's organs and systems, while physiology looks at how those organs and systems work together to keep the body functioning.
AI-Robot
what is enzymes all about?
Mohammed Reply
Enzymes are proteins that help speed up chemical reactions in our bodies. Enzymes are essential for digestion, liver function and much more. Too much or too little of a certain enzyme can cause health problems
Kamara
yes
Prince
how does the stomach protect itself from the damaging effects of HCl
Wulku Reply
little girl okay how does the stomach protect itself from the damaging effect of HCL
Wulku
it is because of the enzyme that the stomach produce that help the stomach from the damaging effect of HCL
Kamara
function of digestive system
Ali Reply
function of digestive
Ali
the diagram of the lungs
Adaeze Reply
what is the normal body temperature
Diya Reply
37 degrees selcius
Xolo
37°c
Stephanie
please why 37 degree selcius normal temperature
Mark
36.5
Simon
37°c
Iyogho
the normal temperature is 37°c or 98.6 °Fahrenheit is important for maintaining the homeostasis in the body the body regular this temperature through the process called thermoregulation which involves brain skin muscle and other organ working together to maintain stable internal temperature
Stephanie
37A c
Wulku
what is anaemia
Diya Reply
anaemia is the decrease in RBC count hemoglobin count and PVC count
Eniola
what is the pH of the vagina
Diya Reply
how does Lysin attack pathogens
Diya
acid
Mary
I information on anatomy position and digestive system and there enzyme
Elisha Reply
anatomy of the female external genitalia
Muhammad Reply
Organ Systems Of The Human Body (Continued) Organ Systems Of The Human Body (Continued)
Theophilus Reply
what's lochia albra
Kizito
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




Source:  OpenStax, Natuurwetenskappe graad 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11078/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Natuurwetenskappe graad 7' conversation and receive update notifications?

Ask