能(Energy) (第五课 5 年级科学 )

第五课。能(Energy)

。无所不在的能 (Energy is everywhere)
。能的转换(Energy transformation--energy can be transformed from one form to another)
。可更新和不可更新的能源(Renewable and Non-renewable Energy sources)

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    néngdelái  yuán tài yáng  fēng  shuǐ  hǎilàng  shíwù  diànchí  shēngwùzhì    hézǐnéng huàshíránliào
1] 能的来源(Energy Sources)：太阳。风。水。海浪。 食物。电池(battery)。 生物质(biomass)。核子能(nuclear energy)。化石燃料。



 néngdexíngshì     tàiyángnéng  rè néng  huàxuénéng  diànnéng  dòngnéng  shēngnéng  shìnéng  guāngnéng  hézǐ  néng
2]能的形式(Different forms of energy)：太阳能(solar energy)。热能(heat)。化 学 能(chemical)。电 能(electrical)。动能(kinetic)。声能(sound)。势 能(potential energy)。光   能(light)。核子能(nuclear energy)。

 wǒménbùkě  yǐ chuàngzàohuòxiāomiènéng   dànshìkě yǐ  bǎnéngcóngyī  zhongxíngshìzhuanhuànchénglìngyī  zhong     xíngshì
3] 我们不可以创造或消灭 能， 但 是可以把能 从 一种 形式转换成 另 一种形式。(Energy cannot be created or destroyed; it can only be changed from one form to another.)

rú    diànfēngshàn diànnéng  dòngnéng
如：(1)电 风  扇。 电能 - - -〉动能。

shǒudiàntǒng   huàxuénéng      diànnéng       guāngnéng  rè néng

(2)手电 筒。    化学能---〉电能 ---〉光能 + 热能。

 

néngyuán
4] 能源(Energy Sources)：
             

kěgèngxīnde néngyuán  fēng  tàiyáng   shuǐ  shēngwùzhì     hǎilàng  shíwù
[A]可更新的能源(Renewable Energy Sources)：
风(wind energy)。太阳(solar energy)。水(hydropower energy)。生物质(biomass energy)。海浪。食物。
           
    bù kěgèngxīndenéngyuán  shíyóu    méi   hézǐ  néng  diànchí
[B] 不可更新的能 源(Non-renewable Energy Sources)：
石油(fossil fuel)。煤(coal)。核子能(nuclear /atomic energy)。电池(battery)。
   
kěgèngxīnde  néngyuánkě  yǐ bèibǔ chōnghé  zàishēngér  bù kěgèngxīndenéngyuánzébù  néng
5] 可更新的能源  可以被补充  和再生，而不可更新的能 源  则不能。
 
 bùkě  gèngxīnde  néngyuánhuiyǒu hàojìn  deyītiān  suǒyǐ  wǒménbì  xūmíngzhì dì  shǐyòngzhèxiēnéngyuán
6]不可更新的能源  会有耗 尽的一天， 所 以我们 必须明智地使用  这些能 源。
   
wǒményingbù  duànyánfā gèngduōxīnde  néngyuánbìngduōshǐyòngkěgèngxīnde  néngyuán
7] 我们应不断   研发更多 新的能源  并 多使用 可更新的能源。

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Reference:

[.] Energy in our daily life:
Each day we experience multiple forms of energy. For example, in the morning you eat breakfast (chemical energy), walk/ bike/ drive to school (mechanical energy / kinetic), and come into a classroom full of light (light energy) and sound (sound energy).


 On the board are magnets (magnetic energy) holding items in place, shooting a rubber band across the room is an elastic (elastic energy to kinetic energy); A pencil falling to the ground is (gravitational energy transforms to kinetic energy), at the front of the room is a smartboard with the day's lesson (electrical energy to light energy). Even though we may just be learning the names, we are very used to using all forms of energy.

[.] Energy conversion/transformation:

[.] Forms of Energy:

[.] Energy:

Energy is important to our lives. We use energy to do work. Energy lights up our cities. Energy moves our cars, trains and enables us to watch televisions. What would happen if there is no energy?

Living things carry out life processess. Energy is needed to carry out these processes. Energy is also needed by non-living things. The energy is used to make them usable. The Sun gives us heat and light energy. Plants use sunlight to make food. Humans and animals get energy form the food they eat. Their sources of food include plants and other animals.

Fuels such as coal, petroleum and natural gas are sources of energy too. These fuels are formed from dead plants and animals that lived millions of years ago.

Energy is found in different forms. The batteries in a toy car produce electrical energy to move it. Objects that move have kinetic energy. A burning candle gives off light energy and heat energy. A strectched rubber band in a catapult has potential energuy.

Energy can be transformed form one form to another. Switching on the light transforms electrical energy into light energy. A burning candle transforms chemical energy into light energy and heat energy. Solar powered signal light uses sunlight as the source of energy. The solar energy is transformed into electrical energy and then into light energy.

The energy we use everyday comes from various resources. These resources are divided into renewable energy and non-renewable energy.


[.] Using energy responsibly:

[.]US Energy consumption by source:



[.]