3. Imagine you're in a big dark
room and weren’t able to see
anything. What do you think will
help you to see things?
4. Correct! You need light! Even the
smallest amount of light might help you
to see the things around you.
5. What is light energy?
Light energy is a form of electromagnetic
radiation. Light consists of photons, which
are produced when an object's atoms
heat up. Light travels in waves and is the
only form of energy visible to the human
eye.
6. We need light to see. Light comes
from different sources called
light sources. Our main natural light
source is the sun. Other sources
include fire, stars and man-made
light sources such as light-bulbs,
candles and torches.
7. There are two sources of light:
• Natural Sources of Light- these include
the sun, stars, fire and electricity in storms.
There are even some animals and plants
that can create their own light such as
fireflies, jellyfish and mushrooms. This is
called bioluminescence.
8.
9. • Artificial Sources of Light- these are
created by humans. Flashlights, candles,
cellphone, and televisions are some
sources of artificial light. Most of the lights
are man-made need an energy source,
such as electricity or batteries, to produce
light.
10.
11. Thanks to light, we see life in
glorious colour: our eyes see
different wavelengths of light
as different colours.
13. Let’s find examples of different
types of light sources at home and
in your environment. You can take
a picture or draw a picture of light
source. Complete your answers on
the table below.
14.
15. Directions: Put a check (/) on the
materials that undergo light
energy and cross (X) if they are
not.
16. _______1 Turning on the salt lamp.
_______2. Clicking on of television
_______3. Hitting the cymbals
_______4. Turning on of lampshade
_______5. Plucking of electric guitar
17. _______6. Blowing of trumpet
_______7. Turning on electric fan
_______8. Playing on your cellphone
_______9. Watching on your computer
_______10. Waving of light stick
18. It’s been 8 hours since the outrage of
electricity in our barangay shut down. The
whole community turns into a dim black
place. You and your sister were left at
home because your mother was still in
work. List down the materials that can
help you to get source of light in your
house.
19. REMEMBER:
✓ Light energy is a kind of kinetic energy with
the ability to make types of light visible to
human eyes. Light is defined as a form of
electromagnetic radiation emitted by hot
objects like lasers, bulbs, and the sun.
20. REMEMBER:
✓ Light contains photons which are minute packets
of energy. When an object’s atoms get heated up,
it results in the production of photons and this is how
photons are produced. The electrons find
excitement from the heat and results in earning
extra energy. The energy is released in the form of
a photon and more photons come out as the
substance gets hotter.
22. _______1. Light energy travels in waves.
_______2. There is only one source of light.
_______3. We could use light to smell the
taste of the food.
_______4. Plants and animals also give off
light energy.
_______5. Batteries are one source of
natural light.
23. _______6. The major source of light is the sun.
_______7. Moon is an example of natural source of
light.
_______8. Light consists of photons, which are
produced when an object's atoms heat up.
_______9. Flashlights, candles, cellphone, and
televisions are some sources of artificial light.
_______10. Light is an example of energy.
24. Draw 3 example sources of
natural and artificial light in
your notebook.
27. For today’s lesson, you will Infer how
light energy is produced and identify
forms of energy involved in it. Let us try
to find out the energy involved in light
energy.
28. Light is a form of energy produced by a
light source. Light is made of photons
that travel very fast. Photons of light
behave like both waves and particles.
29. Light is made up of photons, which are
like tiny packets of energy. When an
object's atoms heat up, photon are
produced from the movement of atoms.
The hotter the object, the more photons
are produced.
30.
31. Natural sources of light include our:
o Sun and other stars- where the source
of energy is nuclear energy
(recall that the moon does not produce
light but merely reflects sunlight)
o Lightning- where the source is
electrical
o Fire- where the energy source is
chemical
32. For years of human history, these were the only
sources of light available until people discovered
burning natural oils and developed candles in
the relatively recent past.
▪ Man-made modern sources of light are
mainly of the three types:
o Incandescent bulbs
o fluorescent bulbs
o Discharge tubes or Neon tubes- used in
store signs
33. The simplest of these devices to understand
is the incandescent light bulb.
Energy exists in many different forms. Examples of
these are: light energy, heat energy, mechanical
energy, gravitational energy, electrical energy,
sound energy, chemical energy, nuclear or
atomic energy and so on. Each form can be
converted or changed into the other forms.
34. Although there are many specific types of
energy, the two major forms are Kinetic
Energy and Potential Energy.
• Kinetic energy is the energy in moving
objects or mass. Examples include
mechanical energy,
electrical energy etc.
35. • Potential energy is any form of energy
that has stored potential that can be put
to future use.
Examples include nuclear energy,
chemical energy, etc.
39. REMEMBER:
✓ Light is a form of energy produced by a
light source.
✓ Light is made of photons that travel very
fast.
✓ There are two sources of lights: Natural
Source of Light and the Artificial Source of
Light
40. REMEMBER:
✓ Energy exists in many different forms.
✓ Each form of energy can be
converted or changed into other form.
41. TRUE or FALSE. Read the statement
carefully. Write T if the statement is
true about light energy and
F if not.
42. ______1. A light source is anything that makes
light, whether natural and artificial.
______2. Without light sources we could not see
the world around us.
______3. A few examples of natural light
sources include the Sun, stars and candles.
______4. We need light to see.
______5. Light appears to travel in straight lines,
travelling from light sources until it hits the
surface of an object.
43. ______6. Energy exists in many different forms.
______7. The hotter the object, the more photons
are produced.
______8. Some light sources are natural, which
means they are not man-made and have not
been made by people.
______9. Fireflies is an example of artificial source
of light.
______10. Electricity is also one source of light.
44. Go in a dark room with a book and flashlight.
Can you see the cover of the book? Can you
see the colors and words on the book? Next,
shine the flashlight on the book. How does
what you see now compare with what you
saw without light? Explain any differences.
What is needed to see objects?
49. Problem: How heat can be transformed
to light?
What you need to do:
1. Grasp the match firmly at its midpoint.
2. Press the match head into the striker.
3. Quickly drag the match head along
the striker.
50. What have you found out?
1. What happened to the matchstick when
rubbed on a rough surface of the
matchbox?
2. What cause a matchstick to catch fire when
rubbed on rough surface?
3. How does heat energy transformed to light
energy?
52. What is Friction?
Friction is a force between two surfaces that are
sliding, or trying to slide, across each other.
Friction always works in the direction opposite to
the direction in which the object is moving or
trying to move. The amount of friction depends
on the materials from which the two surfaces are
made.
53. Friction is important for the first part of
lighting a match. When the matchstick is
rubbed against the rough surface. Due to
increase of friction while rubbing, heat is
produced in large amounts thus causing
the matchstick to burn (fire) which we call
as the light energy.
54. Although there are many specific types of
energy, the two major forms are Kinetic
Energy and Potential Energy.
• Kinetic energy is the energy in moving
objects or mass. Examples include
mechanical energy,
electrical energy etc.
55. Study the picture on how heat energy
can be transformed to light energy.
56. 1. Using your two hands, rotate the spindle as fast as
you can.
2. Then friction will buildup and it will turn to heat
producing a hot ember.
3. Prepare the materials for ideal setup like fire drill.
4. Grab the kindling and use the burning tinder
bundle to ignite it which it will produce fire.
5. Quickly transfer the hot ember into your tinder
bundle and blow, this will ignite your tinder bundle.
57. After analyzing the process that took place in
transforming heat energy to light energy,
complete the picture map to illustrate the
processes involved on how heat energy
transforms to light energy. Choose your
answers from the statements below. Write the
NUMBER only on the circle provided.
58. Direction: Write TRUE if the statement is
correct, if the statement is incorrect
underline the word or group of words
that makes it not correct.
59. __________ 1. Without energy, you will not
be able to accomplish anything.
__________ 2. Heat energy and light energy
are not present in a glowing charcoal.
__________ 3. Heat energy is the result of
the movement of tiny particles called
atoms, molecules, or ions in solid, liquid,
and gas.
60. __________ 4. The energy transformation that was
shown in lightning the matchstick is heat energy
to electrical energy.
__________ 5. Light energy is radiant energy that
moves out in all directions from its sources.
__________ 6. Heat burns the stick and then
tranformed to light that can brighten the
surroundings.
61. __________ 7. Energy transformation changes
energy from one form to another.
__________ 8. Friction produces heat that ignites
the wood to catch fire.
__________ 9. Energy is destroyed in the process
of transformation.
__________ 10. When the matchstick is rubbed
against the rough surface friction is not
produced.
62. You have been out hiking all day
and finally gotten back to your
campsite, only to realize that you
have forgotten all your essential
fire-making equipment. What
should you do to make a fire?
How?
63. REMEMBER:
Energy Transformation is the change of
energy from one form to another.
Heat energy is the result of the
movement of tiny particles called atoms,
molecules, or ions in solid, liquid, and gas.
It is also called thermal energy.
64. REMEMBER:
Light energy is radiant energy that moves out in
all directions from its sources.
Friction is important in the energy transformation
from heat to light. It produces heat energy that
ignites the wood to produce fire which is the light
energy.
65. Choose the letter of the best
answer. Write the correct letter
before the number.
66. __________ 1. Henry rubs his two palms against each
other for a few minutes. How did he feel after rubbing?
A. There is a normal temperature on his two palms.
B. There is an increase of temperature on his two
palms.
C. There is a decrease of temperature on his two
palms.
D. There is no change on the temperature on his two
palms.
67. __________ 2. Striking matchsticks on the matchbox
catches fire. What makes this happen?
A. There is an increase of temperature by friction which
produces heat that cause fire.
B. The side of the matchbox has a magic pill that
cause a fire.
C. The gasoline increases the temperature of the
matchsticks that cause fire.
D. There is a decrease of temperature by friction which
produces heat that cause fire.
68. __________ 3. What energy transformation happens
when a camper rubs two sticks of wood to
produce fire?
A. from light energy to electrical energy
B. from light energy to heat energy
C. from electrical energy to light energy
D. from heat energy to light energy
69. __________ 4. What cause the two rubbing objects to
produce heat?
A. Air
B. Electricity
C. Friction
D. Fuel
70. __________ 5. Which of the following shows a change
from heat energy to light energy?
A. Boiling of water
B. Buzzing of bees
C. Rubbing of two stones
D. Warm of beach sand
71. Give 2 more examples of how
heat energy can be transformed
into light energy. Write it in your
notebook.
76. Answer the following questions:
1. What energy is used when you turned
on the light bulb?
2. What energy is produced when the
light bulb is on?
77. In the activity “Try to Discover”, as
you turn on the light bulb,
electrical energy is transformed
into light energy. This is an
example of energy
transformation.
78. Here are more examples of energy transformation
of electrical to light energy:
79. Mrs. Montemayor just bought a new house.
She wanted to buy appliances before
moving in. Your task is to help Mrs.
Montemayor to shop for her new
appliances. Choose appliances which show
energy transformation from electrical to
light energy.
80. Directions: Analyze each picture on the
box below. Cross out the object which
illustrates energy transformation from
electrical to light energy.
81.
82. Directions: Look at each pair of pictures.
Put a check on the box if it illustrates
energy transformation from electrical to
light energy.
83. Nowadays, life seems so difficult
because of the pandemic. Prices of
basic commodities such as food
increased as well as water and
electric bills. As a grade six pupil, how
will you help your family conserve
electrical energy?
84. REMEMBER:
When energy changes form it is called energy
transformation.
Anything that we plug into electric outlet, we
are using electrical energy and it is transformed
into another form of energy that produces light
energy which is called transformation of energy
from electrical to light energy.
85. REMEMBER:
Examples of energy transformation from electrical
to light energy:
Light bulb
Streetlight
Traffic light
Himalayan salt lamp
Lighthouse
86. Draw a happy face 😊 if the
statement shows the energy
transformation from electrical to
light energy and sad face ☹ if it is
not.
87. _________1. When you plug Himalayan salt
lamp, it will give out a warm, reddish-pink
glow.
_________2. The lighthouse is used to warn ships
of the dangers during darkness.
_________3. Traffic lights are placed at road
intersections and crossings.
_________4. Your mother baked a cake on her
new microwave oven.
88. _________5. The children love to watch the colorful
fireworks display.
_________6. The laundry owner turned on the washing
machine.
_________7. John switched on the lampshade before
going to bed.
_________8. Mom turned on the chandelier in the living
room.
_________9. Your father turned on the emergency light.
_________10. The sun rises on the east.
89. Give 2 more examples of how
electrical energy can be
transformed into light energy.
Write it in your notebook.
