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Om te kan beskryf wat energieverlies beteken

Module by: Siyavula Uploaders. E-mail the author

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:

Figuur 1
Figuur 1 (graphics1.png)

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.

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Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

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| A lens I own (?)

Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks