Table of Contents
How many volts does the filament circuit heat the tungsten filament?
The filament circuit uses the 3 to 5 volts to heat the tungsten filament in the cathode portion of the x-ray tube. Thermionic emission occurs, defined as the release of electrons from the tungsten filament when the electrical current passes through it and heats the filament.
What is the filament of tungsten?
A filament used in incandescent lamps, and as an incandescent cathode in many types of electron tubes, such as thermionic vacuum tubes.
Why the filament is heated?
Electricity runs through a tungsten filament housed inside a glass sphere. Because the filament is so thin, it offers a good bit of resistance to the electricity, and this resistance turns electrical energy into heat. The heat is enough to make the filament glow white-hot.
What is the temperature of bulb filament?
Temperature of an Incandescent Light Bulb
| Bibliographic Entry | Result (w/surrounding text) |
|---|---|
| “Incandescent Lamp.” Encarta. Microsoft, 1998. | “When electric current flows through the filament, it heats the filament to a temperature of about 3000 °C (about 5000 °F), causing the filament to glow and provide light.” |
How many volts does the filament circuit use?
The filament circuit uses 3-5 volts.
What is filament voltage?
Theory: The filament power supply provides heater voltage to the klystron. The heater/filament voltage is a AC voltage that synchronized with the P.R.F. when the transmitter is firing. If the voltage is greater than 105 volts or less than 50 volts this alarm is generated.
What happens to tungsten when heated?
Light bulbs are manufactured with tungsten filaments because tungsten has an abnormally high melting temperature. But tungsten will catch on fire at such high temperatures, if the conditions are right. As more and more atoms evaporate, the filament starts to disintegrate, and the glass starts to get darker.
How does tungsten filament work?
In an incandescent type of bulb, an electric current is passed through a thin metal filament, heating the filament until it glows and produces light. After the electricity has made its way through the tungsten filament, it goes down another wire and out of the bulb via the metal portion at the side of the socket.
Why is filament made of tungsten?
Tungsten has a high melting point, making it ideal for light bulbs. Tungsten is used to make the filament of an electric bulb because it has the highest melting point, lowest vapour pressure, and greatest tensile strength of any metal. It can reach high temperatures before melting as a result of these.
What is the filament of a bulb made of tungsten?
How hot does a tungsten filament get in a lightbulb?
A tungsten filament inside a light bulb can reach temperatures as high as 4,500 degrees Fahrenheit. A glass enclosure, the glass “bulb”, prevents oxygen in the air from reaching the hot filament.
What is a filament circuit?
The primary purpose of the filament circuit is to supply a low current to heat the x-ray tube filament for thermionic emission of electrons. The filament circuit is activated any time the operator adjusts the mA on the generator.