Energy, Work And Power Continued
Overzicht
Work is how energy gets moved around, and power is how fast that happens. But the bigger story is where our energy comes from in the first place: fossil fuels, the wind, the tides, the Sun and the atomic nucleus. Each source has its own balance of benefits and costs.
In this lesson you will link work done to energy transferred with \(W=Fd\), survey the major energy resources and weigh up their advantages and disadvantages, and calculate the efficiency of an energy transfer. You will also see why almost all our energy traces back to the Sun.
Doelstellingen
- Understand that mechanical or electrical work done is equal to the energy transferred
- Recall and use the equation for mechanical working W = Fd = ∆E
- Describe how useful energy may be obtained, or electrical power generated, from: (a) chemical energy stored in fossil fuels (b) chemical energy stored in biofuels (c) water, including the energy stored in waves, in tides and in water behind hydroelectric dams (d) geothermal resources (e) nuclear fuel (f) light from the Sun to generate electrical power (solar cells) (g) infrared and other electromagnetic waves from the Sun to heat water (solar panels) and be the source of wind energy including references to a boiler, turbine and generator where they are used
- Describe advantages and disadvantages of each method in terms of renewability, availability, reliability, scale and environmental impact
- Understand, qualitatively, the concept of efficiency of energy transfer
- [Supplement] Know that radiation from the Sun is the main source of energy for all our energy resources except geothermal, nuclear and tidal
- [Supplement] Know that energy is released by nuclear fusion in the Sun
- [Supplement] Know that research is being carried out to investigate how energy released by nuclear fusion can be used to produce electrical energy on a large scale
- [Supplement] Define efficiency as: (a) (useful energy output) (%) efficiency = (× 100%) (total energy input) (b) (useful power output) (%) efficiency = (× 100%) (total power input) recall and use these equations
Lesnotitie
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Lesevaluatie
Gefeliciteerd met het voltooien van de les op Energy, Work And Power Continued. Nu je de sleutelconcepten en ideeën, het is tijd om uw kennis op de proef te stellen. Deze sectie biedt een verscheidenheid aan oefeningen vragen die bedoeld zijn om uw begrip te vergroten en u te helpen uw begrip van de stof te peilen.
Je zult een mix van vraagtypen tegenkomen, waaronder meerkeuzevragen, korte antwoordvragen en essayvragen. Elke vraag is zorgvuldig samengesteld om verschillende aspecten van je kennis en kritisch denkvermogen te beoordelen.
Gebruik dit evaluatiegedeelte als een kans om je begrip van het onderwerp te versterken en om gebieden te identificeren waar je mogelijk extra studie nodig hebt. Laat je niet ontmoedigen door eventuele uitdagingen die je tegenkomt; beschouw ze in plaats daarvan als kansen voor groei en verbetering.
- A force of 20 N moves an object 5 m in the direction of the force. The work done is: A. 4 J B. 25 J C. 100 J D. 200 J Answer: C
- A machine takes in 800 J and gives 600 J of useful output. Its efficiency is: A. 25% B. 75% C. 133% D. 200 J Answer: B
- Which energy resource is NOT ultimately driven by the Sun? A. wind B. waves C. geothermal D. biofuel Answer: C
- The Sun releases its energy mainly by: A. burning hydrogen as a fuel B. nuclear fusion C. nuclear fission D. chemical reactions Answer: B
- Which is a renewable energy resource? A. coal B. natural gas C. nuclear fuel D. tidal Answer: D
Beschikbaar in de Green Bridge-app
Download de Green Bridge CBT-app op je telefoon of computer voor toegang tot volledige lesnotities, oefenvragen en meer.
Beschikbaar in de Green Bridge-app
Download de Green Bridge CBT-app op je telefoon of computer voor toegang tot volledige lesnotities, oefenvragen en meer.
Aanbevolen Boeken
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