ENGLISH V

LISTENING AND SPEAKING

ALIX ARTEAGA

WHERE DOES OUR ENERGY COME FROM?

WHAT IS ENERGY?Energy is essentially the ability or the capacity to do work. We use energy to do work and make all movements.

Energy takes many forms:

• Heat energy • Mechanical energy • Electrical energy • Chemical energy • Nuclear energy

• Kinetic energy, etc.

SOME FORMS OF ENERGY

WHAT FOR DO WE USE ENERGY?

In our daily lives, there are many things in which we use energy.

Energy:• Cooks our food,• Lights our cities,

• Powers our vehicles,• Gives us pictures on

TV,• Plays our music

and so on.

E.g. When we eat, our bodies transform the food into energy.

HAVE YOU EVER WONDERED WHERE OUR ENERGY COMES FROM?

All of our energy comes from:

• The Sun by solar power cells• Fossil fuels

•Plants got their energy by a process called photosynthesis.

WHAT IS THE DIFFERENCE BETWEEN HEAT AND TEMPERATURE ?

Heat is molecules moving.Temperature is a measure of how fast the molecules are

moving.

HOW IS TEMPERATURE MEASURED?

Temperature is usually measured with a

thermometer.

WHAT IS ABSOLUTE ZERO?

Absolute zero is the coldest possible temperature. When

atoms stop moving altogether.

By international agreement, absolute zero is defined as

precisely;

• 0 K on the Kelvin scale.• –273.15 degrees Celsius on

the Celsius scale.• –459.67 degrees F on the

Fahrenheit scale.

“Energy can be neither created nor destroyed, but can change form”.

E.g. Chemical energy can be converted to kinetic energy in the explosion of a stick of dynamite.

HOW IS ENERGY CONSERVED?

WHY DO WE NEED TO SAVE ENERGY?

It is easy to forget how important energy is or how much energy costs because energy is there whenever we need.

• Energy is not free. All of us pay for the all electricity we use in our houses. Wasting energy is the same as wasting

money.

• Wasting energy is not good for our environment either. Most of the sources we depend on, like coal and natural gas, cannot be replaced. Once we use

them they are gone forever.

VOCABULARY

•Coal: a hard, black substance that is found in the ground and burned as fuel.•Temperature: is the measurement of how hot or cold something is.•Heat: the quality of being hot or warm.•Cell: the smallest living part of an animal or a plant.•Photosynthesis: is a process used by plants and other organisms to convert light energy from the sun into chemical energy.•Fossil fuels: have been formed from organic remains of prehistoric plants and animals.•Remains: the parts of something that exist when other parts of it have gone.

THANKS!