Energy can exist in multiple forms and be obtained from both renewable and non-renewable sources. It transforms from one type to another and can power electrical systems. Producing and using energy has both benefits and environmental impacts. Conservation efforts aim to reduce energy usage and associated problems.

1. Energy
By Alberto fernández
fernández

2. What is energy
• Energy is the ability of an object to change things
around it .
• Energy can be
mechanical, ligth, sound, thermal, electrical, chemic
al or nuclear

3. Sources of energy
• Sources can be :
• Renewable : such as water , wind , sun , biomass
, waves and tides

4. • Non-renewable :Fuels are sources of chemical of
energy . Coal , natural gas , and petroleum are fuels .
• Uranium and plutonium are sources of thermal energy .

5. Energy transforms
• The speakers change the electricity into sound .
• The waves and tides change mechanical energy
into electricity .

6. Electricity
• Electricity is a form of energy :
• We can transport it easily through power lines .
• It trasforms into other types of energy , the light
energy of a light bulb

7. Electrical charges
• Static electricity, it occurs when an object
acumulates electrical charge .

8. Conducting and insulating materials
• Electrical charges move easily through conducting
materials .
• Electrical charges cannot move through insulating
materials like wood , rubber and plastic .

9. Electrical current .
Electrical current is the movement of the electrical charges
through a conducting material .
ELECTRIC CIRCUIT
The elements in a electric circuit are :

10. The generator

11. The conductor

12. The light bulb

13. Producing electricity
HIDROELECTRIC POWER STATIONS :
Use the energy from the reservoirs . Water moves a turbine and its
generates electricity

14. • NUCLEAR POWER STATIONS :
Use uranium or plutonium to produce thermal energy

15. • THERMAL POWER STATIONS:
Burn fuels . Combustion heats water that is converted into steam .
Steam moves a turbine and generates electricity

16. • WIND FARMS AND SOLAR POWER STATIONS :
transform the wind and the sun energy .

17. Energy and the enviroment
Producing and using energy causes problems .
• Changes in the landscape .
The construction of reservoirs changes the landscape

18. • Depletion .
Fuels are non-renewable sources of energy and they can run out .

19. • Pollution .
The burning of fuels produces gases that pollute the air

20. Using energy efficiently
• Turn off the ligths

21. • Use public transport .

22. • Turn off the heaters and air conditioning when its possible . Insulate
homes .

23. • Practise the 3 R `s : reduce , reuse and recycle .

24. Magnetism
Magnetism is the ability of materials to attract metals such as iron and
steel . There are two types of magnets , natural or artificial .

25. Uses of magnets
• Magnets are used in door locks , bags …
• Magnetism are used to store information on credit cards

26. Electromagnetism
• Elctricity produces magnetism .
• Magnetism produces elctricity .

27. • When the wheel turns , the magnet inside the dynamo turns and it
creates an electrical current .

28. THE END