Energy Transfers
Muhtasari
Switch on an old filament lamp and about nine tenths of the electricity you are paying for ends up warming the ceiling. The energy did not vanish and it was not destroyed; it simply went somewhere you did not want it. Tracking where energy goes is one of the most powerful habits in physics.
This lesson names the eight stores energy can sit in and the four pathways it travels by, states the principle of conservation of energy, and shows you how to calculate an efficiency and read the whole story of a device off a single Sankey diagram.
Malengo
- Describe energy transfers involving energy stores (chemical, kinetic, gravitational, elastic, thermal, magnetic, electrostatic, nuclear) and energy transfers (mechanically, electrically, by heating, by radiation)
- 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 and situations, explaining the transfer of the input energy, including their representation by Sankey diagrams
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 an energy store, not a pathway? A) Electrical B) Heating C) Elastic D) Radiation Answer: C
- A device takes in 250 J and produces 50 J of useful output. Its efficiency is: A) 5% B) 20% C) 50% D) 200% Answer: B
- The principle of conservation of energy states that energy: A) is always destroyed by friction B) cannot be created or destroyed, only transferred C) can be created in a power station D) is used up when a device is switched on Answer: B
- In a Sankey diagram, the width of each arrow represents: A) the time taken B) the temperature C) the amount of energy D) the efficiency Answer: C
- Energy stored in a stretched elastic band is in the: A) chemical store B) elastic store C) thermal store D) nuclear store 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.
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