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Energy in Our Daily Life


4.1 Energy in Our Daily Life

4.1 Energy in Our Daily Life
We need energy to carry out activities. 我们需要能量来进行每天的日常活动.

Mild activities

Vigorous activities

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Body functions

4.1 Energy in Our Daily Life

Machines and appliances need energy to work. 机器和电器需要能量来工作运转.

Television

Fan

Vehicles车辆

4.1 Energy in Our Daily Life

The common forms of energy:常用能的形式

Heat

Light
Sound

Electrical Kinetic Chemical Potential

4.1 Energy in Our Daily Life

1. Heat Energy热能
? Sources: Sun, fire, etc. ? The higher the temperature an object has, the more heat energy it can give out.

4.1 Energy in Our Daily Life

2. Light Energy光能
? Sources: candles, bulbs, etc. ? Light energy enables us to see things. ? The more light energy an object gives out, the brighter it is.

4.1 Energy in Our Daily Life

3. Sound Energy声能
? Sources: vibrating objects (e.g. violin strings) ? The more sound energy an object gives out, the louder it is.

Which part of the body vibrates when we talk? vocal cords

4.1 Energy in Our Daily Life

4. Electrical Energy电能
? Sources: dry cells, power stations, etc. ? It is a useful form of energy in our daily life. ? Electrical appliances do not work without electrical energy.

4.1 Energy in Our Daily Life

5. Kinetic Energy动能
? Kinetic energy: possessed by moving objects ? The faster an object moves, the more kinetic energy it has

more kinetic energy

less kinetic energy

4.1 Energy in Our Daily Life

6. Potential Energy势能
? Potential energy: stored by stretched or compressed objects ? Gravitational potential energy: stored when objects are raised

A person walked from G/F to 5/F and then returned to G/F. Did he gain any gravitational potential energy?

No, he gained it first but then lost it.

4.1 Energy in Our Daily Life

7. Chemical Energy化学能
? Chemical energy: stored in substances like trees, coal, oil, food etc.

4.1 Energy in Our Daily Life

4.1
Write down the forms of energy involved in the following picture.
Light and heat from the Sun E

A
Light energy from the screen

B Kinetic & potential energy of the ball

Sound energy from the cheering boy Chemical energy in food F D

Kinetic energy of C the running player

4.1 Energy in our daily life

End of section 4.1

4.1 Energy in Our Daily Life

4.2 Energy Changes
4.3 Fuels

4.4 Generating Electricity
4.5 Energy Sources and Us


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