The document discusses different sources of light, heat, electricity, and sound, categorizing them into natural and artificial types. It explains how various power generation methods, such as geothermal, hydropower, solar, and wind, produce electricity for home use. Additionally, it describes how sound is created through vibrations from various sources like objects, vehicles, animals, instruments, and humans.

1. Sources of Light, Heat,
Electricity, and Sound

5. Sources of Light

15. ☼Natural Sources of Light
- A light source that is formed by
nature and not made by humans.
Examples:

16. Objects that produce their own light:
Firefly Crystal
jellyfish
Glow worms

17. The sun is a star that is the
closest one to Earth and thus
outshines all the other stars.
UY Scuti is a red
supergiant star that is
way more bigger than
the sun.

18. ☼Artificial Sources of Light
- A light source that are man-made or
artificial.
- Some are using batteries, plugged into an
electrical power outlet.
- Others are lighted by fire.

19. Sources of Heat
- Sources of light are most often also
sources of heat.
- Others do not visibly give off light.
- Heat energy also can come from
electricity.

20. Sources of Electricity
Electricity is carried by power lines that
are connected to our homes and buildings. These
power lines come all the way from power plants
that produce energy from different sources.

21. Geothermal power plants use
hydrothermal resources that have
both water (hydro) and heat
(thermal). They require high-
temperature (300°F to 700°F)
hydrothermal resources that come
from either dry steam wells or
from hot water wells.
Hydropower plants capture the
energy of falling water to
generate electricity. A turbine
converts the kinetic energy of
falling water into mechanical
energy. Then a generator
converts the mechanical energy
from the turbine into electrical
energy.

22. Tongonan Geothermal Power Plant is situated in
Kananga, Leyte in the Philippines. The Power
Plant generates and supplies electricity in Leyte

23. The sun shines on the solar panels
and the panels absorb the energy,
creating direct current (DC)
electricity. The electricity is fed into
what is called a solar inverter. This
converts the current into alternating
current (AC) electricity. The AC
current is then used to power the
appliances in your home.
Wind turbines are tall towers
topped with blades. The blades
are connected to a vertical
shaft, or rod. When wind causes
the blades to spin, they turn
the shaft. The turning shaft
provides power to a machine
called a generator, which
produces electricity.

24. - Batteries also provide electricity. They
come in different shapes and sizes.
Button cell batteries
Automotive battery
Cylindrical batteries
Mobile phone batteries

25. Sources of Electricity
-Under the Earth
-Energy from the Sun
-Force of Water
-Power of winds

26. Explore Around:
Electricity Detective
(Page 308-309)

27. Sources of Sound
- Sounds are produced when molecules
vibrate as a result of a movement or an event.
- Vibrations are quick, up-and-down or
back-and-forth movements that produce sound
waves.

28. ♪ Sounds can come from OBJECTS

29. ♪ Sounds can come from VEHICLES

30. ♪ Sounds can come from ANIMALS

31. ♪ Sound can come from INSTRUMENTS

32. ♪ Sound can come from PEOPLE

33. Uses of Light, Heat, Sound,
and Electricity