Wiktor Wise
An electric bulb, also known as an incandescent lamp or light bulb, is a simple device that converts electrical energy into light energy. It is an electric lamp consisting of a transparent or translucent glass housing containing a wire filament that emits light when heated by an electric current. The filament is enclosed in a glass bulb that is either evacuated or filled with inert gas to protect the filament from oxidation. Electric bulbs have been in use for over a century and are used in movable lighting fixtures, vehicle lights, domestic and industrial lighting, and lighting for decorations and advertisements.
| Characteristics | Values |
|---|---|
| Definition | A simple source of light that converts electrical energy into light energy |
| Other Names | Light bulb, incandescent lamp, incandescent light globe, electric arc lamp |
| Main Components | Tungsten filament, electrical contact spiral base, glass mount |
| Glass Mount Composition | Inert gas (e.g. argon) to prevent filament from burning and increase its lifespan |
| Filament Composition | Thin wire (e.g. tungsten, carbonized paper/bamboo) that heats up and glows when electricity is passed through it |
| Light Produced | Warm light, white light |
| Advantages | Affordable, easy to install, long working time (8,000-15,000 hours), comes in various sizes and shapes, high output |
| Disadvantages | Energy inefficient, short lifetime (1,000 hours), fragile, contains harmful chemicals (e.g. mercury) |
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What You'll Learn
How electric bulbs work
An electric bulb is a device that emits light when electricity is applied to it. The incandescent light bulb, also known as an incandescent lamp or incandescent light globe, is an electric light that produces illumination by heating a filament until it glows.
The light bulb hasn't changed drastically since its invention by Thomas Edison in 1879. It is made up of only a handful of parts. The filament is enclosed in a globe-shaped glass mount and is connected with copper and lead wires to the lamp's base. The wires and the filament are enclosed in a glass bulb, which is filled with an inert gas like argon. Since argon is an inactive gas, it protects the filament from burning as well as increases the lifetime of the filament. Thin glass is used to manufacture the bulb, preventing the air from reaching the filament to protect it from burning.
When electric power is passed through the bulb, it reaches the filament through copper and lead wires. The base holds the bulb upright and connects to the electric circuit. Copper and lead wires allow the electricity to pass from the base to the tungsten filament. It causes the filament to emit light and glow.
The tungsten filament is made of a long, incredibly thin length of tungsten metal. In a typical 60-watt bulb, the tungsten filament is about 6.5 feet (2 meters) long but only one-hundredth of an inch thick. The tungsten is arranged in a double coil in order to fit it all in a small space. That is, the filament is wound up to make one coil, and then this coil is wound to make a larger coil.
When a tungsten atom evaporates, it will often collide with an argon atom and bounce back toward the filament, where it will rejoin the solid structure. Since inert gases normally don't react with other elements, there is no chance of the elements combining in a combustion reaction.
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History of the lightbulb
An electric bulb is a device that emits light when electricity is applied to it. This simple device has been in use for over a century, and its development has had a significant impact on how we use energy in our homes and offices.
The history of the lightbulb began around 1800 when Italian scientist Alessandro Volta noticed that a copper wire lit up when connected to the terminals of a battery. Humphry Davy made the initial attempt to build a lightbulb in 1802, using a carbon electrode as a filament. However, the filament burned out quickly. The first constant electric light was demonstrated in 1835, and for the next 40 years, scientists worked on improving the incandescent lamp, experimenting with different filament materials and bulb atmospheres.
In the 1850s, British physicist and chemist Joseph Swan began working with carbonized paper filaments in an evacuated glass bulb. By 1860, he had a working device, but it had a short lifetime and was inefficient. Thomas Edison, often credited as the inventor of the lightbulb, began his research in 1878 and patented his incandescent lightbulb in 1879 and 1880. Edison focused on improving the filament, testing different materials before returning to a carbonized cotton thread filament. He also developed a better vacuum pump to remove air from the bulb and created the Edison screw, which became the standard for light bulb fittings.
Other inventors, such as Heinrich Göbel, William Sawyer, and Albon Man, also contributed to the development of the lightbulb, and it was a series of small improvements that led to the creation of the modern light bulbs we use today. The lightbulb has undergone changes over the years, with the development of fluorescent and LED bulbs, but the basic idea remains the same.
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Uses of electric bulbs
An electric bulb is an electrical device that emits light when electricity is passed through it. This simple device has been used for lighting for over a century.
Domestic and Industrial Lighting
Electric bulbs are used for lighting in homes, buildings, and streets. They are used in movable lighting fixtures like table lamps, as well as in automobile headlights and vehicle lights.
Portable Lighting
Electric bulbs are used in handheld, portable lights that have a 12+ hour battery life.
Decorative and Advertising Lighting
Electric bulbs are used in lighting for decorations and advertisements.
Heat Source
Electric lamps can also be used as heat sources, for example, in incubators, infrared lamps in fast-food restaurants, and toys such as the Easy-Bake Oven.
Other Uses
Electric bulbs are also used in infrared heaters for industrial processes such as paint curing and space heating. They are also used as indicator lights in consumer electronics and professional audio gear.
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Advantages and disadvantages
An electric bulb is a device that emits light when electricity is applied to it. The bulb has a filament enclosed in a glass mount, which is then connected to copper and lead wires that are connected to the lamp's base. When electricity is passed through the bulb, it reaches the filament, which emits light and glows.
Advantages
Electric bulbs have a wide range of applications, from handheld, portable lights to lighting our homes, streets, and buildings. They are also used in vehicles and for decorative and advertising lighting. Electric bulbs are affordable, easy to install, and come in various sizes and shapes. They have a longer life than any other light source, with a working time range of 8000 to 15000 hours.
Disadvantages
One of the main disadvantages of electric bulbs is their energy inefficiency. They consume a lot of energy, and only a small percentage of that energy is converted into visible light, with most of it being released as heat. This also results in increased running costs. Additionally, electric bulbs are fragile due to their glass composition and should be handled with care to avoid breakage. They contain harmful chemicals like mercury, which can escape as vapour or droplets if the bulb breaks.
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Structure of the bulb
An electric bulb is a simple device that emits light when an electric current is passed through it. The structure of the bulb hasn't changed much over the years, although newer bulbs may differ in terms of technology.
The bulb has three main components: a tungsten filament, an electrical contact spiral base, and a glass mount filled with argon gas. The filament is a coiled thin wire made of tungsten, which has a high melting point to avoid melting. It is connected to copper or lead wires that are attached to the base of the lamp. The filament sits in the middle of the bulb and is held up by a glass mount. The glass mount is filled with argon gas, which is an inert gas that protects the filament from burning and increases its durability.
The wires and the filament are enclosed in a glass bulb, which can be transparent or translucent. The glass bulb is designed to prevent air from reaching the filament, thereby protecting it from burning. The base of the bulb holds it upright and connects it to the electric circuit. The copper and lead wires allow electricity to pass from the base to the tungsten filament, causing it to emit light and glow. This process happens extremely quickly, with the filament heating up to the point of incandescence and glowing white-hot.
The bulbs come in various sizes and shapes and are used in a wide range of applications, including portable lighting, vehicle lights, car headlights, flashlights, decorative lighting, and advertising lighting. They typically have a working time of 8,000 to 15,000 hours but are known to be energy inefficient, fragile, and expensive to operate.
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Frequently asked questions
An electric bulb is a device that emits light when electricity is passed through it. The electricity is passed through a metal filament, heating it to a glowing white heat and producing illumination.
An incandescent light bulb is a type of electric bulb that uses a filament enclosed in a glass bulb, which is either evacuated or filled with an inert gas to protect the filament from oxidation. The filament is heated until it glows, producing light. Incandescent bulbs are less energy-efficient than other types of electric lighting, with only around 5% of the energy consumed converted into visible light.
The electric bulb was invented by Thomas Alva Edison, although there were earlier attempts by Alessandro Volta, Humphry Davy, Marcellin Jobard, Warren De la Rue, Frederick de Moleyns, Jean Eugène Robert-Houdin, Moses G. Farmer, and Alexander Lodygin (also known as Alexander de Lodyguine).
