Energy, Work And Power Continued
Gbogbo ọrọ náà
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.
Ebumnobi
- 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
Akọmọ Ojú-ẹkọ
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ayẹwo Ẹkọ
Ekele diri gi maka imecha ihe karịrị na Energy, Work And Power Continued. 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.
- 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
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Àwọn Ìwé Tó Dáa Láti Kà
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Energy, Work And Power Continued? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
Dawunlodi Ẹpp naa lori Google Playstore.
Ihe nile ichoro iji nwee ihe ịga nke ọma na JAMB, WAEC & NECO.
