Beatrice Lang
An electric bulb is a device that emits light when electricity is applied. The concept of the light bulb was invented by Thomas Alva Edison in 1879, and it has been in use for more than a century. The structure of the bulb has changed over the years, but it still functions by conducting electricity through a metal filament that heats up and glows, producing light. The bulb is made of glass and contains an inert gas like argon to prevent the filament from burning and increase its lifetime.
| Characteristics | Values |
|---|---|
| Definition | A device that emits light when electricity is applied |
| Other Names | Incandescent lamp, incandescent light globe, incandescent bulb |
| Components | Tungsten filament, electrical contact spiral base, glass mount |
| Glass Mount Contents | Inert gas (argon), copper and lead wires |
| Working Time | 8,000-15,000 hours |
| Affordability | Affordable and economical |
| Ease of Installation | Easy to install |
| Sizes | Vary with light output and operation of the bulb within a voltage range |
| Voltage Range | 1.5 Volts to about 300 Volts |
| Wattage | 2-100 watts |
| Average Wattage | 60 watts |
| Average Monthly Cost | $0.52 |
| Average Yearly Cost | $6.22 |
| Safety Measures | Handle with care as they can break very easily |
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What You'll Learn
The bulb's filament
The filament's role in producing light centres on the principle of incandescence, where an electric current passes through the filament, heating it to a high temperature until it glows and emits visible light. This process is highly efficient in incandescent bulbs, with the filament reaching temperatures that cause it to glow and produce bright light.
The design of the filament has evolved over time. Early attempts at creating a functional light bulb used carbon filaments, which had a short lifespan due to their quick burning. The development of vacuum chambers and the use of platinum filaments improved longevity, but the high cost of platinum limited its commercial viability.
Today, LED filament bulbs have gained popularity. These bulbs use a matrix of smaller, lower-power LED chips that resemble the filaments of traditional incandescent bulbs. This design not only enhances the aesthetic appeal but also improves light distribution. LED filaments are known for their energy efficiency and longer lifespans, making them a preferred choice in modern lighting applications.
The filament's composition and structure are critical to its performance and longevity. The use of materials like tungsten, with its high melting point, ensures that the filament can withstand high temperatures without melting. Additionally, the inert gas within the bulb, such as argon, prevents the filament from burning and extends its lifespan by inhibiting evaporation.
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Glass housing
An electric bulb is a device that emits light when electricity is applied to it. The structure of the bulb has changed over the years, but the basic idea remains the same. The bulb works by conducting electricity through a metal filament that is heated to a glowing white heat. The current causes the metal to become incandescent and emit light.
The filament of an electric bulb is enclosed in a glass bulb, which is filled with an inert gas like argon. The glass is thin and manufactured to prevent air from reaching the filament, protecting it from burning. The glass bulb also increases the lifetime of the filament. The inert gas helps to prevent the filament from becoming too hot and breaking.
The glass bulb is an essential component of the electric bulb. It is manufactured to be thin and prevent air from reaching the filament, which could cause it to burn. The glass is also filled with an inert gas, which further protects the filament. The glass bulb is designed to be strong enough to withstand the heat and pressure of the filament while also allowing light to pass through.
The glass bulb is typically globe-shaped and contains the filament, which is made of tungsten. The filament is connected to the base of the bulb through copper and lead wires. The base of the bulb holds it upright and connects it to the electric circuit. The glass bulb is also designed to be removable, allowing for easy replacement if the filament burns out.
The glass housing of the electric bulb is an important part of the overall design and function of the bulb. It protects the filament, increases its lifetime, and allows light to pass through. The glass bulb is manufactured with specific standards to ensure the safe and effective functioning of the bulb.
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Inert gas
An electric bulb is a device that emits light when electricity is applied. The earliest bulbs were invented in the early 1800s, but it was Thomas Alva Edison who is credited with developing a practical incandescent lamp in 1879.
The bulb's thin filament is enclosed in a glass mount and is connected to copper and lead wires that lead to the lamp's base. The wires and filament are contained within a glass bulb, which is then filled with an inert gas. The inert gas is typically argon, but nitrogen is also used. Since these gases are inactive, they protect the filament from burning and increase its lifetime. The thin glass used to manufacture the bulb prevents air from reaching the filament, further protecting it from burning.
When electricity is passed through the bulb, it reaches the filament through the copper and lead wires. The filament emits light as it heats up. This process happens extremely quickly. The base of the bulb holds it upright and connects it to the electric circuit.
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Incandescence
An electronic bulb, also known as an incandescent bulb, is a source of artificial light. It works on the principle of incandescence, which is a general term for light produced by heat.
The bulb is designed to be held upright by the base, which also connects the bulb to the electric circuit. Copper and lead wires allow electricity to pass from the base to the filament, causing it to heat up and emit light. The base of the bulb can be either a spiral or two-side nails type, with the latter containing two pieces of lead that connect the lamp to the electric circuit.
Incandescent bulbs are known to be less energy-efficient than other types of electric lighting, with less than 5% of the energy they consume converted into visible light. Most of the energy is released as heat. However, they are still widely used due to their low manufacturing costs, versatility, and compatibility with different power sources.
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History
The history of the light bulb is a long one, with many inventors contributing to its development over almost two centuries. The story begins in 1799–1800, when Italian inventor Alessandro Volta developed the first electric battery, known as the voltaic pile. This early manifestation of incandescent lighting demonstrated that a continuous source of electricity could be generated by connecting a copper wire to either end of the pile.
In 1802, Vasily Vladimirovich Petrov developed the first persistent electric arc, and in 1806, English chemist Humphry Davy gave a practical demonstration of an arc light. This rudimentary lamp burned out quickly and was too bright for practical use, but it laid the groundwork for future innovations. Throughout the 19th century, scientists and inventors worked to improve the design of the incandescent lamp, tinkering with the filament and the bulb's atmosphere. These early bulbs had extremely short lifespans, were too expensive to produce, or used too much energy.
In the late 1870s and 1880s, intense competition and innovation marked the race to develop a functional incandescent lamp. Inventors like Joseph Swan in the UK and Thomas Edison in the US worked independently to create successful designs. Swan's bulbs were based on designs by William Staite, but the filaments were too thick. Edison's design used thinner filaments, leading to a better design. The rivalry between Swan and Edison eventually led to a merger, forming the Edison and Swan Electric Light Company.
Thomas Edison is often credited as the inventor of the light bulb, as he patented the first commercially successful bulb in 1879 and began commercializing it in 1880. However, it is important to recognize the contributions of many inventors who paved the way for Edison's success. In 1882, Edison demonstrated that electricity could be distributed from a centrally located generator through a series of wires and tubes. He also developed the first electric meter to track customer electricity usage.
The next significant change in the incandescent bulb came in 1904 with the invention of the tungsten filament by European inventors. These new bulbs lasted longer and produced a brighter light compared to the carbon filament bulbs. William David Coolidge, an American physicist with General Electric, further improved the manufacturing process for tungsten filaments in 1910. Tungsten remains the primary material used in incandescent bulb filaments today.
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Frequently asked questions
An electric bulb is a device that emits light when electricity is applied. It is also known as an incandescent bulb or lamp. The bulb works by conducting electricity through a metal filament that is heated to glowing white hot.
The filament of an electric bulb is made of tungsten. It is enclosed in a glass bulb that is either evacuated or filled with an inert gas like argon to protect the filament from oxidation. When electricity is supplied to the terminals, the flow of electrons heats up the thin filament until it begins to glow.
On average, incandescent light bulbs use about 60 watts of electricity, while LED light bulbs use about 10 watts. Using an incandescent light bulb for 2 hours per day will use about 12.2 kilowatt-hours of electricity per month and 43.8 kilowatt-hours of electricity per year.
