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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

differentiate between demand and supply giving examples
Lambiv Reply
differentiated between demand and supply using examples
Lambiv
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Lambiv
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Venny Reply
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Rezat Reply
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Eliyee
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Eliyee
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WARKISA
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Lambiv
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Aster Reply
appreciation
Eliyee
explain perfect market
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
What is ceteris paribus?
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
Can I ask you other question?
Shukri
what is monopoly mean?
Habtamu Reply
What is different between quantity demand and demand?
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
Ezea
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Shukri
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Lilia Reply
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Fiker Reply
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.
Shukri
production function means
Jabir
What do you think is more important to focus on when considering inequality ?
Abdisa Reply
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Awais Reply
sir...I just want to ask one question... Define the term contract curve? if you are free please help me to find this answer 🙏
Asui
it is a curve that we get after connecting the pareto optimal combinations of two consumers after their mutually beneficial trade offs
Awais
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Asui
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 .
Feyisa Reply
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 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11078/1.1
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