© Edisco Editrice, Torino - Tutti i diritti riservati
Unit 2.4 Applications
Page 99


10. Complete the text with the correct words.

BULBS

Incandescent bulbs use a 1. filament inserted in 2. glass; when electricity reaches the filament, it becomes 3. and glows.
Halogen bulbs use a 4. filament in a mixture of 5. gases; the tungsten evaporates, but the reaction with the gases prevents blackening and increases 6. .
In 7. bulbs gases and 8. react to activate a chemical 9. that ultimately produces 10. light.
LED and OLED bulbs (the latter also including organic components) use 11. material; electrons combine with the semiconductor and emit 12. that produce light.
11. Watch the video and match the beginnings and endings.
consume less energy.have a filament inside the globe.reports information on watts, lumens, and colour.can save more than 200 dollars a year using LED bulbs.its type, brightness, and colour.are as bright as incandescent bulbs.the amount of visible light emitted by the bulb.lumens are now used to indicate the brightness of a bulb.
When buying a light bulb, you need to consider… →
Incandescent bulbs… →
Compact fluorescent and LED bulbs… →
Modern bulbs help… →
An average household… →
Instead of watts… →
Lumens measure… →
Bulb packaging… →
12. Write a report comparing the different types of bulbs presented, using the information given below. Which type would you choose for your home and why?

Incandescent bulbs (800 lumens)
Energy consumption: 60 W
Life (in years): 1
Savings: 0%
Purchase cost (average): € 1-2

Halogen bulbs (800 lumens)
Energy consumption: 43 W
Life (in years): 1-3
Savings: Up to 30%
Purchase cost (average): € 2-3

CFL bulbs (800 lumens)
Energy consumption: 14 W
Life (in years): 6-10
Savings: Up to 75%
Purchase cost (average): € 3-4

LED bulbs (800 lumens)
Energy consumption: 13 W
Life (in years): 15-25
Savings: Up to 80%
Purchase cost (average): € 5-8 aperta