Invention and Parts of the Incandescent Bulb

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Questions and Answers

What is the function of the filament in a light bulb?

To connect the bulb to the electrical source.

To heat up and produce light when electricity passes through it. (correct)

To provide a protective casing for the bulb.

To contain the inert gas within the bulb.

Which part of the light bulb serves to connect the filament to the power supply?

Electrical contacts (correct)

Inert gas

Glass support

Brass cap

What is the role of the inert gas inside a light bulb?

To enhance the brightness of the light produced.

To conduct electricity.

To cool down the light bulb gradually.

To prevent the filament from oxidizing and extending its lifespan. (correct)

Which component acts as a housing for the filament in a light bulb?

Glass support Signup and view all the answers

What is the primary material of the brass cap in a light bulb?

Brass Signup and view all the answers

What is the main material used for the filament in an incandescent bulb?

Tungsten Signup and view all the answers

Which of the following parts supports the tungsten filament and holds it in place?

Support wires Signup and view all the answers

What role does the glass envelope play in an incandescent bulb?

Surrounds the internal parts Signup and view all the answers

What is unique about the gases used in an incandescent bulb?

They consist of inert gases at low pressure Signup and view all the answers

What part of the incandescent bulb connects to the lamp's electrical contacts?

Electrical contacts Signup and view all the answers

Who demonstrated electric lamps in Newcastle, England, in 1878?

Joseph Swan Signup and view all the answers

What significant discovery did Thomas Edison make in 1879 regarding light bulbs?

A carbon filament in an oxygen-free bulb could glow for 40 hours. Signup and view all the answers

Which inventor patented an improved carbon filament in 1881?

Lewis Howard Latimer Signup and view all the answers

What advancement did Willis R. Whitney achieve in 1903?

He developed a treatment for the filament preventing it from darkening. Signup and view all the answers

What did Edison's bulb eventually achieve in terms of duration?

Over 1500 hours of illumination. Signup and view all the answers

What is the primary function of the coiled tungsten filament in a light bulb?

To emit light when electricity passes through it Signup and view all the answers

Which component of the light bulb is responsible for connecting the filament to the source of electricity?

Electrical contact Signup and view all the answers

What is the purpose of the mixture of inert gases inside a light bulb?

To prevent the tungsten filament from oxidizing Signup and view all the answers

Where is the screw cap located in relation to other components of the light bulb?

On the bottom end of the bulb Signup and view all the answers

Which component helps secure the filament in its position within the bulb?

Support wires Signup and view all the answers

Which element is NOT used in the manufacturing of incandescent lamps?

Silicon dioxide Signup and view all the answers

What classification do large incandescent lamps fall under?

General and task lighting Signup and view all the answers

Which gas is commonly used in incandescent lamps to prevent oxidation?

Argon gas Signup and view all the answers

Which component contributes to the actual light-emitting part of an incandescent lamp?

Coiled tungsten Signup and view all the answers

Which of the following materials is used as insulation in incandescent lamps?

Mica Signup and view all the answers

Who is credited with inventing the first incandescent electric light?

Humphry Davy Signup and view all the answers

What significant improvement did Lewis Howard Latimer make to the incandescent light bulb?

Developed a method for manufacturing carbon filaments Signup and view all the answers

What year did Thomas Edison discover a carbon filament that glowed for 40 hours?

1879 Signup and view all the answers

Which scientist demonstrated a practical electric lamp in Newcastle, England?

Sir Joseph Wilson Swan Signup and view all the answers

What milestone did Edison's carbon filament bulb achieve?

Lasted for over 1500 hours Signup and view all the answers

Which element is primarily responsible for the filament in incandescent lamps?

Coiled tungsten Signup and view all the answers

What is the purpose of the argon gas in incandescent lamps?

To prevent oxidation of the filament Signup and view all the answers

Which of the following is NOT commonly used in manufacturing incandescent lamps?

Silicon Signup and view all the answers

Which component is used to prevent the filament from coming into contact with the glass?

Mica Signup and view all the answers

What role does the inert gas play in incandescent lamps?

It prevents the filament from burning out quickly Signup and view all the answers

Which type of lamp is commonly associated with simulating daylight?

Low Voltage GLS Lamps Signup and view all the answers

In which application are miniature lamps typically utilized?

Automotive, aircraft, and appliance applications Signup and view all the answers

What characterizes PAR 38 Lamps among the listed options?

They can provide high levels of illumination. Signup and view all the answers

Which lamp type is best suited for applications that require additional durability?

Rough Service GLS Lamps Signup and view all the answers

Which of the following types of lamps is primarily used for heating purposes?

Infrared Heat Lamps Signup and view all the answers

What is the primary purpose of a resistor in a lamp circuit?

To limit the current flowing through the circuit Signup and view all the answers

Which type of lamp is specifically designed for use in photography?

Photographic lamps Signup and view all the answers

What is the effect of using a resistor rated at 1/4 watt in a neon lamp circuit?

Limits the current to a safe level Signup and view all the answers

In the context of lamps used in photography, what is the significance of the term 'integral' when referring to a resistor?

It means the resistor is built into the lamp assembly Signup and view all the answers

What could be a potential drawback of using photographic lamps?

They have a shorter lifecycle compared to other lamps Signup and view all the answers

Which type of miniature lamp is mentioned as having an integral resistor?

T3 1/4 - 10mm MBC Neon Lamp Integral Resistor Signup and view all the answers

What is a common application for miniature lamps?

Automotive and aircraft applications Signup and view all the answers

Which miniature lamp type does NOT include an integral resistor?

T3 1/4 - 10mm MES Neon Lamp Without Resistor Signup and view all the answers

Which of the following miniature lamp types is the smallest?

T1 1/4-4mm Sub-Miniature Signup and view all the answers

What is a characteristic of the T3 1/4 - 10mm MES Neon Lamp?

It is designed without an integral resistor. Signup and view all the answers

Study Notes

Incandescent Bulb

Invented by David Coolidge in the early 20th century
Revolutionized lighting with a longer-lasting tungsten filament

Parts of an Incandescent Bulb

Coiled tungsten filament: Glows brightly when electricity passes through it
Connecting wires: Carry electricity from the bulb's base to the filament
Electrical contacts: Metallic base that connects to lamp's electrical contacts
Glass envelope: Surrounds the light bulb and its internal parts, made of glass
Glass fuse enclosure: Insulates the bulb's fuses, located in the bulb's stem
Mixture of inert gases: The bulb is filled with non-reactive gases at low pressure
Screw cap: Threaded base that secures the bulb to a lamp
Support wires: Holds the filament in place

Invention of the Light Bulb

Early experiments by Joseph Swan (1878): Carbon paper filaments worked but burned out quickly; demonstrated electric lamps in Newcastle, England
Thomas Alva Edison's discoveries: experimented with various filaments for long-lasting materials; developed a carbon filament in an oxygen-free bulb that glowed for 40 hours; a bulb lasting over 1500 hours
Lewis Howard Latimer's improvements: invented an improved carbon filament and patented a method for its manufacture; member of Edison's research team "Edison's Pioneers"

Elements used in Manufacturing

Lead-in wire
Glass
Argon gas
Inert gas
Coiled tungsten
Mica
Copper
Nitrogen

Classification of Incandescent Lamps

Large lamps: Used for interior and exterior lighting
Miniature lamps: Used in automotive, aircraft, and appliance applications

Miniature Lamps

Types:
- PAR 38 Lamps
- Infrared Heat Lamps
- Rough Service GLS Lamps
- Low Voltage GLS Lamps
  - Daylight Simulation Lamps
Applications: Automotive, aircraft, and appliance applications.

Photographic Lamps

Used in photography and projection service.

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Description

Explore the history and components of the incandescent bulb, invented by David Coolidge and improved by pioneers like Thomas Edison and Joseph Swan. This quiz delves into the various parts of the bulb and its significance in revolutionizing lighting technology.