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What does a thyristor do in a circuit?
A thyristor is a solid state three terminal electronic power switch with two power terminals which carry the operational part of the device current and one gate or trigger terminal which is used to switch on the thyristor when required.Whenever the current flowing though it changes diirection or simply falls to zero, a thyristor will switch off.Unlike a transistor, after its gate/trigger signal is removed a thyristor will remain switched on for as long as the direction of the current flowing through it remains the same, even if the amperage of that current changes.Unlike a mechanical switch the thyristor has operational supply polarities ( positive & negative of the supply ) which have to be observed. Therefore it can switch on and conduct for one supply polarity only.Since it is a solid state device a thyristor can operate at much faster switching speeds than any electro-mechanical switch.With a DC supply of correct polarity, a thyristor will conduct when triggered but will not then switch off till the current is interrupted by some other means such as removal of the supply or by use other, much more complex, circuitry which forces the current to flow in the reverse direction.With an AC supply, when triggered a thyristor will conduct when the supply is of correct polarity and will then automatically switch off when the AC supply polarity reverses.For controlled operation in both directions, using the gate as a trigger on the both the forward and the reverse part of the AC Supply, a second thyristor connected with reverse polarity has to be used in parallel with the first one. This idea is basically what is used to make AC lamp dimmers nowadays.========================================================A thyristor is a transistor having a thyratron-like characteristic; as collector current is increased to a critical value, the alpha (amplification factor) of the unit rises above unity to give a high-speed triggering action.That description just given (now shown in italics) is wrong! It is not for a thyristor but for a thermistor!A thermistor is a device with 2 wires coming out of it which changes its resistance to electrical current flow as its temperature is changed. They are used in devices that have to perform some job based on the temperature of the medium they are in.The thyristor is a solid-state semiconductor device with four layers of alternating N- and P-type material. They act as bi-stable switches, conducting when their gate receives a current pulse, and continue to conduct for as long as they are forward biased. (That is, for as long as the voltage across the device has not reversed).Some sources define silicon controlled rectifiers and thyristors as synonymous. Other sources define thyristors as a larger set of devices with at least four layers of alternating N and P-type material.========================================================Re. the error shown in italics above... The first answer at the top of the page is correct: a thyristor (aka SCR or Silicon Controlled Rectifier) is a four layer solid-state switch, and a thermistor is a temperature-sensitive device consisting of a material with a high thermal coefficient of resistance, either positive or negative.Thyristors are solid-state semiconductor devices with four layers of alternating N- and P-type material. They act as bi-stable switches, conducting when their gate receives a current pulse, and continue to conduct for as long as they are forward-biased (That is, as long as the voltage across the device has not reversed).
Why the size of a fuse holder increase as the rating of a fuse?
As a general rule, the larger the current rating of the fuse, the larger will be the fuse holder (or at least the metal contacts) because it will have to be capable of handling larger currents without overheating.
The larger the conductor the Higher the resistanc Lower the ampacity Higher the voltage Lower the resistance?
No. The larger the conductor the lower the resistance and the higher the ampacity.
Can wire size make a difference to the amperage?
Yes, as the wire size physically becomes larger so doesits capacity to handle a larger current.
What size wire for a 3200 amp service?
For a 3200 amp service, the appropriate wire size will depend on several factors, including the type of wire (copper or aluminum), insulation type, and installation conditions (such as ambient temperature and conduit use). Generally, for copper wire, you would typically use 2500 kcmil or larger, while for aluminum wire, you might use around 3500 kcmil or larger. It's crucial to consult the National Electrical Code (NEC) and a qualified electrician to ensure compliance with local codes and safety standards.
What is the difference between heavy hole and light hole in semiconductor physics?
In semiconductor physics, heavy holes and light holes are types of charge carriers with different effective masses. Heavy holes have a larger effective mass and move more slowly than light holes in a semiconductor material. This difference in mobility affects the electronic properties of the material, such as conductivity and energy levels.
Why carbon is not used as semiconductor material?
Carbon has unique properties that make it challenging to use as a semiconductor material. It can exist in multiple structures (diamond, graphite, etc.) with varying electrical properties, making it difficult to control and predict its behavior as a semiconductor. Additionally, fabricating carbon-based semiconductor devices is technologically complex and expensive compared to traditional semiconductor materials like silicon.
What are the Factors that determine resistance value of electrical material?
The factors that determine the resistance value of an electrical material are its length, cross-sectional area, temperature, and resistivity. A longer material will have higher resistance, while a larger cross-sectional area will result in lower resistance. The resistance of a material also changes with temperature, with most materials increasing in resistance as temperature rises. Finally, resistivity is an intrinsic property of the material that determines how strongly it resists the flow of electricity.
What is higher 5.8e7 or 9.5e5 conductivity of metals?
5.8e7 is a larger number than 9.5e5. 5.8e7 can be written as 58,000,000, and 9.5e5 can be written as 950,000. Conductivity is a measure of the ability of a material to conduct electricity. A large conductivity means that the material conducts electricity well. The units of electrical conductivity are siemens per meter (Sm-1).
How heat transfer in solid is affected?
Heat transfer in solids is affected by factors such as the thermal conductivity of the material, temperature gradient across the solid, surface area available for heat transfer, and the thickness of the solid. Higher thermal conductivity, larger temperature gradient, and larger surface area lead to faster heat transfer in solids, while increased thickness hinders heat transfer. Additionally, the presence of impurities or defects in the solid can also affect heat transfer capabilities.
Why does density make it difficult for electricity to pass through?
Electricity takes the path of least resistance. Conductivity of a material has a larger impact than density does.
Would you expect two wires side by side to conduct electricity better than a single wire?
They would not conduct electricity better but by running conductors in parallel of equal length from the source to the load will double the ampacity of the circuit. The electrical code specifies that only conductors of 1/0 copper or aluminum or larger can be run in parallel.
What factors affect the speed of current flow?
The factors that affect the speed of current flow include the material through which the current is flowing (conductivity), the cross-sectional area of the conductor, the voltage applied, and the resistance in the circuit. A higher conductivity material, larger cross-sectional area, higher voltage, and lower resistance will result in a faster current flow.
What is a large object at the same temperature as a smaller one has more or less thermal energy?
Thermal energy depends on mass, temperature and specific heat capacity of the material. Larger means, is that in mass? If so then thermal energy would be more in larger compared to that smaller at the same temperature provided both are made up of the same material.
The main difference of the semiconductor lasers and gas lasers?
Semiconductor lasers use a semiconductor material as the gain medium, typically a diode, and are more compact, efficient, and cost-effective. Gas lasers, on the other hand, use a gas mixture as the gain medium and are generally larger, more powerful, and more complex, making them suitable for high-power applications such as cutting and welding.
How long does heat flow to one substance into another?
The time it takes for heat to flow from one substance to another depends on factors such as the thermal conductivity of the substances, the temperature difference between them, and the contact area between the substances. It can range from seconds to hours, with higher thermal conductivity and larger contact area typically resulting in faster heat transfer.
How fast can heat dissipate?
The rate at which heat dissipates depends on factors such as the material involved, its surface area, and the temperature difference between the object and its surroundings. In general, heat dissipates faster in materials with good thermal conductivity (e.g., metals) and with larger surface areas. Additionally, factors like airflow and insulation can also influence the rate of heat dissipation.
