Because if the thin filament wire was heated in regular air it would burn up.
A: There circuitry inside to boost the voltage to 300 500 volts and a triac to conduct the current but the bulbs as opposed to vacuum there is gas inside those coils.
"They" do that by creating a vacuum inside the bulb (i.e., there's no oxygen in the bulb to burn).
Modern bulbs are usually filled with a mixture of argon and nitrogen. More rarely, some bulbs are filled with pure argon, krypton or xenon. The earliest bulbs weren't filled with any gas, but had vacuum inside.
No, there is a vacuum or inert gas such as argon or nitrogen inside light bulbs to prevent oxidation and prolong the lifespan of the filament. Air does not play a role in the functioning of a light bulb.
Modern bulbs are usually filled with a mixture of argon and nitrogen. More rarely, some bulbs are filled with pure argon, krypton or xenon. The earliest bulbs weren't filled with any gas, but had vacuum inside.
It would no longer work. Light bulbs are usually under vacuum and if air gets in the filament blows.
Examples of vacuums include the vacuum inside a sealed jar, the vacuum of outer space, and the vacuum inside a vacuum cleaner.
Electric bulbs do have the inert gasses inside and not oxygen to avoid explosions.
Argon or dry nitrogen are common fill gasses in high wattage bulbs. But low wattage bulbs are just vacuum with no fill.
No, a vacuum by definition is a space with no air molecules present. Therefore, there are no air molecules inside a vacuum.
A vacuum is an empty space with nothing inside it.
They enable us to do things at night.