DLI 3rd grade guide

Name: ______________________

Linking Words and Phrases:

Linking Word and Phrases:

Before long,

Fact 1

The frst 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 flament inside the glass bulb. This invention took place around 1878.

Possible Word Bank: arc lamp incandescent carbon

tungsten flament

Linking Word and Phrases:

Today,

Linking Word and Phrases:

Fact 3

In conclusion,

The flament 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 flament last longer.

Conclusion

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

3 rd Grade Four Square Informative/Explanatory