Energy Transfers
Gbogbo ọrọ náà
Every machine, every organism and every star runs on energy transfers. The physics of where energy sits, how it moves and how much of it ends up doing something useful is one of the most practical topics you will study.
In this lesson you will meet the eight energy stores, the four transfer pathways, the conservation principle, efficiency calculations with Sankey diagrams, and the three mechanisms by which thermal energy spreads - conduction, convection and radiation - together with ways to slow them down.
Ebumnobi
- Describe energy transfers involving energy stores: chemical, kinetic, gravitational, elastic, thermal, magnetic, electrostatic, nuclear
- Use the principle of conservation of energy
- Know and use the relationship between efficiency, useful energy output and total energy output
- Describe a variety of everyday and scientific devices explaining the transfer of energy, including Sankey diagrams
- Describe how thermal energy transfer may take place by conduction, convection and radiation
- Explain the role of convection in everyday phenomena
- Explain how emission and absorption of radiation are related to surface and temperature
- Investigate thermal energy transfer by conduction, convection and radiation
- Explain ways of reducing unwanted energy transfer such as insulation
Maapụ uche
E seela isiokwu a ka ị hụ otu echiche si ejikọta.
Mepee maapụ uche na ngwa
Kaadị ncheta
Omume ncheta ngwa ngwa n'ihe a na-anwale n'isiokwu a.
Mee omume kaadị ndị a na ngwa
Akwụkwọ Ọmụmụ
Ndetu Nkuzi Zuru Ezu di na Ngwa Green Bridge
Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.
Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Energy Transfers. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- Which of the following is NOT an energy store? A) Chemical B) Electrical C) Kinetic D) Nuclear Answer: B
- A device receives 400 J and outputs 300 J usefully. Its efficiency is: A) 75% B) 133% C) 25% D) 100% Answer: A
- Which thermal transfer mechanism works through a vacuum? A) Conduction B) Convection C) Radiation D) All three Answer: C
- In a Sankey diagram, the width of an arrow represents: A) Speed B) Temperature C) Amount of energy D) Type of store Answer: C
- Cavity wall insulation mainly reduces: A) Radiation through walls B) Convection and conduction in the wall cavity C) Sound transfer D) Light transfer Answer: B
Rue ajuju ndi a n'ime ngwa ahu
Rue ajuju ndi a n'ime ngwa ahu
Akwụkwọ A Na-atụ Aro
Mụtakwuo ihe site na isi mmalite mepere emepe
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Akụkụ akwụkwọ
Mechanical Energy and Conservation of Energy
Explain the law of conservation of energy in terms of kinetic and potential energy
"Physics: Mechanical Energy and Conservation of Energy" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/9-2-mechanical-energy-and-conservation-of-energy. Access for free at https://openstax.org/books/physics/pages/1-introduction
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Akụkụ akwụkwọ
Heat, Specific Heat, and Heat Transfer
Explain heat, heat capacity, and specific heat
"Physics: Heat, Specific Heat, and Heat Transfer" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/11-2-heat-specific-heat-and-heat-transfer. Access for free at https://openstax.org/books/physics/pages/1-introduction
Ndị otu ndị ọzọ bipụtara ha n'okpuru ikike mepere emepe, anyị na-ekele ha dị ka ha si chọọ. Njikọ na-emepe saịtị ha.
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Energy Transfers? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
Budata Ngwa Ahụ Na Google Playstore
Ihe nile ichoro iji nwee ihe ịga nke ọma na JAMB, WAEC & NECO.
