Energy Transfers
Muhtasari
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.
Malengo
- 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
Maelezo ya Somo
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Tathmini ya Somo
Hongera kwa kukamilisha somo la Energy Transfers. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- 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
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Vitabu Vinavyopendekezwa
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Energy Transfers? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
Pakua Programu Kwenye Google Playstore
Kila kitu unachohitaji ili kufaulu katika JAMB, WAEC & NECO.
