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Natuurwetenskappe

Energie-oordrag en stelsel

Besparing van energie

Opvoeders afdeling

Memorandum

1. Hitte/warmte.

2. Baie na min.

3. Hitte vanweë wrywing: al die energie word dus nie vir die dryf van die wiele gebruik nie

4. Hitte: of vanweë wrywing by die band op teer en dus die persoon wat trap. Weer eens word al die energie nie doeltreffend aangewend nie.

5. Warmwatersilinder, warm bad, swembad, huis na buite, ens.

6. Enjin wat olie brand (al die brandstof ontbrand nie), slinger wat gebuig is en nie maklik draai nie, swak kontakpunte in elektriese apparaat soos motors, stomp gereedskap (boorpunte, saaglemme, ens.).

7. Ligte wat onnodig brand, warmwatersilinder wat nie afgeskakel word nie, onnodige gebruik van apparaat, bv. verwarmers as die huis nie goed geїnsuleer is nie, warm water in bad en dan wag dat dit afkoel as dit te warm is, elke keer warm water oopdraai as iets in die kombuis afgespoel word, ens.

Leerder afdeling

Inhoud

Aktiwiteit: om te kan beskryf wat energieverlies beteken [lu 2.3, lu 3.2]

  • Bestudeer die volgende sketse en beantwoord die vrae wat daarop volg:

1. In watter vorm gaan die energie uit die huis en uit die koppie tee verlore?

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2. Die energie beweeg dus van waar daar s ________________________ is na waar daar ___________________________________ is (vul in min of baie)

3. Dink aan 'n ander voorbeeld: 'n persoon bestuur 'n kar waarvan een van die remme vasgeslaan het. Energie gaan verlore. In watter vorm? Beskryf:

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4. Nog 'n voorbeeld: jy ry op jou fiets, maar een van die bande is pap. Energie gaan verlore. In watter vorm? Beskryf:

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In albei hierdie gevalle (3 en 4) gaan energie verlore omdat die stelsel nie reg funksioneer nie.

Onnodige energieverlies kan ook plaasvind as stelsels wat goed funksioneer, nie korrek gebruik word nie, byvoorbeeld as jy 'n yskasdeur dikwels oopmaak of die deur vir lang tye laat oop staan, of wanneer jy 'n bietjie melk in 'n klein kastrol op 'n groot stoofplaat opwarm.

5. Noem nou nog vier voorbeelde waar energie verlore gaan omdat dit versprei van waar daar baie is na waar daar min is.

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6. Noem ook vier voorbeelde van energieverlies vanweë 'n sisteem wat nie reg funksioneer nie:

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7. Noem ook vier voorbeelde waar energieverlies plaasvind omdat toerusting foutiewelik gebruik word:

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Assessering

Leeruitkomste 2: Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.

Assesseringstandaard 2.3: Dit is duidelik wanneer die leerder inligting interpreteer.

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 impak van wetenskap en tegnologie verstaan.

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
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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, Natuurwetenskappe graad 6. OpenStax CNX. Sep 17, 2009 Download for free at http://cnx.org/content/col11080/1.1
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