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hello boys and girls today I'm not going to do my beautiful drawings I have done

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these mind map and that you will have available to and I'm going to explain it

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on this okay so this is our review of the unit four of the unit energy okay

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the one that we did when the quarantena started okay so we haven't studied it in

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class only here with a computer okay so energy what is energy energy is the

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ability of something to perform at work okay to do something really okay it's a

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bit complex that concept but it's just the ability to work okay there are many

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different forms of energy in the world these are the forms of energy do you

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remember mechanical which can be potential or kinetic potential energy is

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the one that an object has just because it's in an up it's up okay it's in the

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top of something this is the energy it has because it can fall okay thanks to

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gravity this is the energy that it has okay kinetic energy is the energy that

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any object has when it's moving right chemical energy is the energy that you

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can find in fuel or in the food that you eat. You eat the food, it has

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proteins and carbohydrates and fats and that gives you energy to move.

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Electrical energy that you can find in many different house

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appliances. The nuclear energy that you can get when you break

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the nucleus of an atom, radiant energy which is the light, thermal energy which

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is heat, and sound. Sound is also a type of energy. So these are the different

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forms of energy. Remember it's very important that the energy is never

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created or destroyed, it just changes the form. So for example the energy

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that is in, I don't know, in a chocolate bar that you eat is a chemical energy

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and you transform this chemical energy into kinetic energy for example if

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you're running okay and you use this energy that the food gives you it's the

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same with lots of different processes of energy many energy do you remember the

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exercise we did about the water the water in the in the reservoir has

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potential energy because it's up when you open the door las compuertas the

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water falls down so this energy is transformed with the turbines into

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electrical energy okay but first has potential energy and then kinetic

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because it's moving okay it rotates okay so this is important that energy is

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never created or destroyed it just changes the form where does energy come

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from different sources of energy okay do you remember there is renewable energy

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that means that it never runs out for example solar energy will always have

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the Sun okay well maybe in four thousand billion years it disappears but we don't

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count this as as an end of the solar energy okay we have eolic energy because

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of the wind hydroelectric energy do you remember it's also renewable because

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thanks to the Sun the water cycle is always renewing okay and the biofuels

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Biofuels are made sometimes with the excrements of living things, or with the dead bodies

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of living things, things that are also created, that we also have, we'll always have.

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Then we have the non-renewable energies, for example petroleum, it will run out anytime.

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Natural gas, though it might be confusing because it's natural, but there is a limited

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amount of natural gas in the in the world so it's a non-renewable energy the same with coal

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and uranium which is the the element that we use for the nuclear energy okay all these types of

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energy are non-renewable that means that they run out okay there's a limited amount of these

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sources of energy right okay do you do you remember that renewable energies have

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um they are good for nature and non-renewable energies have some problems like the acid rain

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or pollution okay deforestation they have different problems okay and then and the other

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important thing about this unit was saving energy okay you remember saving energy is good for the

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environment and remember to save energy there are many things in the book they say lots of things

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about the the houses with special kinds of roofs but important things for you to do are the three

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r's okay you have to remember reduce that means use less things okay don't use a lot of things

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if you can only use one for example if you have a mobile phone and it works perfectly why do you

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have to change it you don't have to change it just because a new model has been in fashion okay

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if your mobile phone works you don't have to change it okay this is reduce you don't need to

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have many many many things because then what do you do with them okay this is just creating more

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waste so reduce important reuse when you have something that you don't use anymore hello

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when you have something that you don't use anymore and you can give it another opportunity you can

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use it for another thing these are the typical things like for example with the cartons with

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different papers, you can use them again or you can create new things. And recycle.

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When you finish using papers, you have to recycle them in the blue bin. When you

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finish using glass, you have to recycle them in the green bin. Remember to

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recycle the things that you cannot use anymore. So these are the important

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things about energy.