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