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BST primary classes

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.

 

SOURCES OF ENERGY

Sun

Electric bulb

Explosion

Flame

LED (Light Emitting Diode)

Fire

Moon

Tube light

 

Uses of light energy

It helps us to see things.

It helps plants to make food and grow.

It is used in power satellites and space stations.

It is used in many electronic appliances.

The energy of light from the sun can be harvested to solar panels and can be used for domestic use since it is eco-friendly and cost effective too.

Materials that can reflect light

Smooth and shinning surface like glass, water, or polished metals.

 

SOUND ENERGY

Sound energy is produced when an object vibrates. The sound vibrations cause waves of pressure that travel through a medium, such as air, water, wood or metal. Sound energy is a form of mechanical energy.

Today’s Use of Sound Technology

Cellular Telephone

Motion Picture

Telephone

C.D.’s Televisions

Phonographs

Electronics

Hearing Aids

Video Tape Recorders

Video Cameras

Speakers

Stethoscopes

Microphone

 

Strategies & Activities:

Step: Teacher revises the previous topic.

Step 2: Teacher introduces the new topic.

Step3: Teacher explains the new topic.

Step4: Teacher welcomes pupils’ questions.

Step5: Teacher evaluates the pupils.

 

Assessment & Evaluation:

  1. explains the sources and uses of light energy.
  2. Show that some objects reflect light.
  3. Sound energy.
  4. Some musical instrument.

 

Assignment:

  1. Explains two sources of light energy.
  2. List three materials that can reflect lights.
  3. Explains the meaning of sound energy.

 

See also

Forms of Energy

MODERN TECHNOLOGY

Forms of Technology

Characteristics of living things

ANIMALS

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