1. Energy
What is
energy?

2. What is energy?
Energy is the capacity of an
object or body to transform
an energy source into work.
The quantity of energy is
the equivalent of the quantity
of work.

3. Units of energy
• The international System (IS)
measures energy in joules (J) and
kilojoules.
1000 J = 1 KJ
• Heat energy is often measured in units
called calories (cal) and Kilocalories
(kcal).
1 cal = 4,18 J

4. Different types
of energies

5. Muscle energy
Years ago, muscle energy was the main source of energy, but we
have invented different mechanisms and machines that have
improved our quality of life.
For example:
★Bicycles need our muscle energy when we move the pedals.
★Kitchen appliances need electricity to work, as televisions and
computers.

6. Mechanical Energy
★Kinetic Energy
★Potential Energy

7. Electrical
energy

8. Electromagnetic
energy

9. Sound energy

10. Chemical energy

11. Nuclear energy

12. Thermal or calorific
energy

13. POWER

14. t
W is work,
measured in
joules (J)
t is time,
measured in
seconds (s)
P= W
P is
power,
measured
in watts
(W)
The power of a machine is the quantity of work it
can do per unit of time. Power is expressed in the
formula:

15. Transformation of energy
It’s when we transform an
initial form of energy into
other forms of energy.
Examples: Chemical to
electrical energy, luminous
to electrical energy...

16. Energy sources

17. What is?
Energy sources are natural resources that provide
different forms of energy. This energy is transformed
for specific uses. They are classified into:
●
renewable sources
●
non-renewable sources

18. Renewable energy sources

19. Hydraulic energy

20. Solar energy:
➔Termal
system:
➔Photovoltaic
energy:

21. Wind energy

22. Marine energy
➔Tidal energy: ➔Wave energy: ➔Ocean
Thermal
energy:

23. Geothermal energy

24. Biomass

25. Municipal solid waste

27. Nuclear energy

28. Coal

29. Petroleum

30. Natural gas

31. Non- Renewable energies and the
environment

32. Green house effect

33. Acid Rain

34. Oil Spills

35. Nuclear Waste

36. Rising Water temperature

37. Atmospheric
Pollution

38. THE END
By: Berta
Parera,
Marta Pera
& Guisla
Roig.