Formative 1.2 Contact Points and Light Bulbs

What is the purpose of removing air from an incandescent bulb?

• To increase brightness

• To prevent the tungsten from oxidizing

• To reduce heat

• To lower cost

What is the role of the glass envelope in a light bulb?

• To conduct electricity

• To protect the filament

• To provide insulation

• To increase brightness

What is the function of support wires in a light bulb?

• To conduct electricity

• To provide structural support

• To increase brightness

• To reduce heat

What is the purpose of the black-colored epoxy in some bulbs?

• To conduct electricity

• To separate contact points

• To increase brightness

• To reduce heat

What is the role of phosphor in a fluorescent bulb?

• To emit UV light

• To absorb UV light and emit visible light

• To conduct electricity

• To provide structural support

What did Warren De La Rue use in his first attempt to produce an incandescent bulb?

• Carbonized bamboo

• Platinum coil

• Charcoal filament

• Gallium arsenide

What did Heinrich Gobel use to secure a carbonized bamboo filament in an incandescent lamp?

• Glass container

• Platinum wires

• Charcoal strips

• Silicon casing

What did Joseph Wilson Swan patent in 1878?

• A tungsten filament lamp

• A carbon filament incandescent light bulb

• A bamboo filament lamp

• A halogen lamp

What innovation did Philips Co introduce in 1991?

• Halogen filled incandescent lamps

• Photo flash light bulbs

• Magnetic induction light bulb

• Bamboo filament light bulb

What was the role of Herman Sprengel in the development of the light bulb?

• He invented the tungsten filament

• He produced the mercury vacuum pump

• He created the first incandescent lamp

• He developed the halogen lamp