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What is a high resistance circuit?
AnswerThe resistance of a material depends on its length, cross-sectional area, and resistivity. This is expressed by the following equation:resistance = [(resistivity x length) / cross-sectional area]So, resistance is directly-proportional to the resistivity and length of the material, and inversely-proportional to its cross-sectional area. So a high resistance can be obtained by increasing the length of the material or by decreasing its cross-sectional area, or by choosing a material with a high resistivity.It's also worth pointing out that resistivity is affected by temperature. For pure metals, the higher the temperature, the higher the resistivity, so the higher the resisistance. For example, a hot (i.e. an operating) tungsten lamp will have a much higher resistance than a cold tungsten lamp.
Is the resistance lower if you have a high current?
Lower than what? For the same voltage, a lower resistance means higher current. But beware, the voltage itself might depend on the current - thus - with a fixed resistance if you change the voltage, you will increase the current in the same proportion. Some things become higher resistance if they get hot (a tungsten filament in a lamp). Other things become lower resistance if they get hot (semiconductors). So it can all depend on what kind of circuit you have.
Does plastic have a high resistance?
Yes, it has a high resistance as it is an insulator.
Why is the cathode ray tube's filament made of tungsten?
Because tungsten has a high melting point. This allows it to be heated red/white hot without melting. This high temperature results in the thermionic emission (boiling off) of electrons which are needed for the CRT to work. Tungsten also has a low vapour pressure at high temperatures, so it won't evaporate too quickly, and it is relatively cheap.
What is high resistance and low resistance?
Low resistance lets electrons through easy, and high makes it harder for them to pass. Basically electricity is harder to flow through high resistance and vice versa.
What is a good conductor and has high resistance?
tungsten
Is tungsten a good conductor at a low or high resistance?
Tungsten is a good conductor with high resistance. It is commonly used in applications that require high resistance to heat and wear, such as light bulb filaments, because it can maintain its structural integrity at high temperatures.
What is the defect if you use tungsten for domestic wiring?
Because tungsten is having high resistance and therefore heat loss will be more
Does tungsten have high resistance?
Yes, tungsten has one of the highest resistance levels of any metal, making it an ideal material for use in applications requiring high resistance to heat and electricity, such as light bulb filaments and electrical contacts.
Does tungsten oxidize?
Tungsten does not oxidize easily at room temperature due to its high melting point and resistance to corrosion. However, at high temperatures or in the presence of oxygen, tungsten can form tungsten oxides.
Is tungsten a semiconductor?
No, tungsten is not a semiconductor. Tungsten is a metal known for its high melting point and resistance to corrosion. Semiconductors are materials that have conductivity between that of a conductor and an insulator, like silicon or germanium.
What are novel applications of tungsten alloys?
The hardness and heat resistance of tungsten can contribute to useful alloys. Tungsten's high melting point makes tungsten a good material for applications like submarine ballistics. Tungsten alloys are used in a wide range of applications, including the aerospace and automotive industries and radiation shielding.Superalloys containing tungsten, such as Hastelloy are used in turbine blades and resistants. Tungsten's heat resistance makes it useful in composite applications as can be a highly-conductive metal to withstand the high temperatures.
Is tungsten a ferrous metal?
No, tungsten is not a ferrous metal. Ferrous metals are those that contain iron, while tungsten is a non-ferrous metal. Tungsten is known for its high melting point and is commonly used in applications where strength and heat resistance are important.
What are some devices that are wired such that they have a high resistance in order to create heat?
A light bulb is the best example. The tungsten creates such a high resistance that all the accumulated heat produces light energy.
What is a gray metal with high melting point used in incandescent lights called?
Tungsten is a metal with a high melting point that is often used in incandescent lamps.
Why is tungsten used in cutting tools?
Tungsten is used in cutting tools because it is very hard and has a high melting point, making it ideal for withstanding the high temperatures and pressures generated during cutting operations. Tungsten also has good wear resistance, allowing cutting tools to maintain their sharpness and cutting edge for longer durations.
Which is stonger zirconium or tungsten?
Tungsten is stronger and more durable compared to zirconium. Tungsten has a higher tensile strength and hardness, making it an excellent choice for applications that require high strength and resistance to wear and tear. Zirconium is known for its high corrosion resistance and biocompatibility, making it suitable for different applications such as jewelry and medical implants.
