3rd grade Instructional Guide

Name: ______________________

Linking Words and Phrases:

Linking Word and Phrases:

Fact 1

Before long,

The first commonly used electric light source was the arc lamp. Bright sparks jumped between two rods to produce light.

Fact 2

Thomas Edison invented the incandescent lamp that used a carbon filament inside the glass bulb. This invention took place around 1878.

Possible Word Bank: arc lamp incandescent carbon

tungsten filament

Introduce topic

Linking Word and Phrases:

Light bulbs are mechanical devices that produce light.

Today,

Linking Word and Phrases:

Fact 3

In conclusion,

The filament in modern light bulbs is made of tungsten. Tungsten is brighter than carbon and lasts longer at high temperatures. Today’s light bulbs also use special gases that help the filament last longer.

Conclusion

Light bulbs use special metals and gases to efficiently produce light.

Four Square Informative/Explanatory Example ©Canyons School District