When a device is used in a circuit in which the voltage is 81V?
When a device is used in circuit in which the voltage is 81V , current flowing the device is 3A . The resistance is 27 ohm. V = IR ; 81 = 3 R ; R = 81/ 3 = 27. This answer has been confirmed as correct and helpful.
Which of the following accurately describes semiconductor diodes?
Answer Expert Verified Junction diodes are preferred over point-contact diodes for most purposes; accurately describes semiconductor diodes.
Are junction diodes preferred over point-contact diodes?
Unlike point-contact diodes, junction diodes utilize a point of metal wire in contact with a single wafer of P-type or N-type material. Junction diodes are preferred over point-contact diodes for most purposes.
Which of the following is true about semi conductors?
A material is classified as a semiconductor if its resistance to the flow of electric current is too low to permit it to be called a conductor is true about semi-conductors.
Can electricity pass through semiconductors?
At a low temperature, almost no electricity passes through them. But when the temperature rises, electricity passes through them easily. Semiconductors containing almost no impurities conduct almost no electricity. But when some elements are added to the semiconductors, electricity passes through them easily.
When an electron is displaced in a semiconductor?
When an electron is displaced in a semiconductor, the hole that’s left behind is attracted to the negative terminal of the voltage source. When an electron is displaced in a semiconductor, the hole that’s left behind is attracted to the negative terminal of the voltage source.
Which of the following are semiconductors of electricity?
Elemental semiconductors (materials with only one element) include antimony, arsenic, boron, carbon, germanium, selenium, silicon, sulfur, and tellurium. Silicon is the best known of these as they form the basis of a large number of electric circuits.
What are the two most used semiconductor materials?
What are the most used semiconductor materials? The most used semiconductor materials are silicon, germanium, and gallium arsenide. Of the three, germanium was one of the earliest semiconductor materials used. Germanium has four valence electrons, which are electrons located on the outer shell of the atom.
What are two examples of semiconductors?
Some examples of semiconductors are silicon, germanium, gallium arsenide, and elements near the so-called “metalloid staircase” on the periodic table. After silicon, gallium arsenide is the second most common semiconductor and is used in laser diodes, solar cells, microwave-frequency integrated circuits, and others.
Where do we use semiconductors?
CPUs that operate personal computers are also made with semiconductors. Many digital consumer products in everyday life such as mobile phones / smartphones, digital cameras, televisions, washing machines, refrigerators and LED bulbs also use semiconductors.
Why are semiconductors preferred?
Any piece of electronics not only needs conductors to deliver electrical energy efficiently, but also semiconductors to control the flow, and insulators to stop the electricity going where it’s not supposed to. Because semiconductors, silicon in particular – can be tuned for its conductivity based on doping.
What companies use semiconductors?
INTC, TSM, and QCOM lead the biggest semiconductor companies list. Corporations and consumers globally use semiconductors—small conductors of electricity also known as semis or chips—in a millions of devices, including space vehicles, car computers, smartphones, medical equipment, appliances, and more.
Why do we use semiconductors?
Semiconductors are employed in the manufacture of various kinds of electronic devices, including diodes, transistors, and integrated circuits. Such devices have found wide application because of their compactness, reliability, power efficiency, and low cost.
What is N and P Semiconductor?
The term p-type refers to the positive charge of a hole. As opposed to n-type semiconductors, p-type semiconductors have a larger hole concentration than electron concentration. In p-type semiconductors, holes are the majority carriers and electrons are the minority carriers.
Why are conductors better than semiconductors?
Since semiconductors lie between the conductors and the insulators it switches over between the two materials at essentially two different temperatures which makes it more flexible. The current flow is controlled within the desired level.
Is germanium a semiconductor?
Germanium is a chemical element with the symbol Ge and atomic number 32. It is a lustrous, hard-brittle, grayish-white metalloid in the carbon group, chemically similar to its group neighbors silicon and tin. Pure germanium is a semiconductor with an appearance similar to elemental silicon.
Is germanium harmful to humans?
Germanium is not an essential element. Its acute toxicity is low. However, at least 31 reported human cases linked prolonged intake of germanium products with renal failure and even death. Signs of kidney dysfunction, kidney tubular degeneration, and germanium accumulation were observed.
Why is Si preferred over GE?
The structure of Germanium crystals will be destroyed at higher temperature. However, Silicon crystals are not easily damaged by excess heat. Peak Inverse Voltage ratings of Silicon diodes are greater than Germanium diodes. Si is less expensive due to the greater abundance of element.
Is germanium more expensive than silicon?
Another important reason is that Silicon is less expensive than the Germanium, as the raw material for Silicon is available in abundance. The leakage current in Silicon is much lesser than Germanium. Mainly the fabrication process is easy, due to the low melting point of the Silicon.
Why is Germanium a semiconductor?
Germanium atoms have one more shell than silicon atoms, but what makes for the interesting semiconductor properties is the fact that both have four electrons in the valence shell. As a consequence, both materials readily constitute themselves as crystal lattices. Substituted atoms alter the electrical properties.
Why silicon is used in Zener diode?
Silicon does not get damaged easily due to excess heat. Variation of Ic0 with temperature is not much hence thermal stability is maintained. Also reverse voltage of silicon diode is higher. Therefore silicon is the most used material for manufacturing diodes.
Why leakage current is more for germanium diode?
Much of the leakage current is due to surface conduction, related to the lack of cleanliness of the semiconductor surface. Both leakage currents increase with increasing temperature, approaching a µA for small silicon diodes. For germanium, the leakage current is orders of magnitude higher.
What is leakage current in reverse biased?
Reverse leakage current in a semiconductor device is the current from that semiconductor device when the device is reverse biased. Hence, it is also called reverse saturation current. The term is particularly applicable to mostly semiconductor junctions, especially diodes and thyristors.
Why do diodes have leakage current?
An important conduction limitation of PN junction diode is leakage current. When a diode is reverse biased, the width of the depletion region increases. Minority carriers of each material are pushed through the depletion zone to the junction. This action causes a very small leakage current to occur.
When would you use a germanium diode?
Again, if you’re not using the circuit for temperature-sensitive applications, a lot of current or voltage, germanium diodes could replace silicon diodes, especially for home projects, and especially if you are using low power and need to be very efficient with power.