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It is a semiconductor device with two terminals, typically allowing the flow of current in one direction only. It may also be termed as the electronic component with two electrodes known as the anode and the cathode. Most diodes are made with semiconductor materials such as silicon, germanium, or selenium. The diode acts as a valve in the electronic and electrical circuit.
Wiki User
∙ 6y ago
Wiki User
∙ 14y agoA diode is a semiconductor device that passes current in one direction only. Sometimes, in the case of zener diodes, it conducts in both directions, but at a different voltage in the reverse direction.
Diodes can be used for...
- Rectifiers, to convert AC to DC
- Auctioneering/Isolation, where one of two sources can supply the load, but those sources must not interfere with each other
- Voltage reference, particularly for zeners
- Clipping, in order to narrow the voltage range of a signal
- Detection, in order to demodulate a signal from a carrier
- Mixing, in order to mix an RF signal with a Local Oscillator in the superhetrodyne receiver
There are other uses - this list is only a sample
Wiki User
∙ 14y agoA diode is a semiconductor that allows current to flow in one direction only. This makes a diode suitable for changing AC to DC.
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Which type of diode used in bridge rectifier?
You can use most diodes for that purpose, and particularly silicon diodes. However, you should not use zener diodes and similar for rectification purposes. Otherwise, you will likely not get the intended result. If the voltage exceeds the avalanche voltage, then the zener diode will no longer rectify, but conduct the other way as well.
How do you select diode size?
Diodes are usually rated in amperage. A diode may be capable of handling only a 10th of an ampere. Some diodes called Power diodes may be capable of handling up to 100 amperes per diode. To select the proper diode, you must know what the maximum amperage your circuit is capable of. Then you would select one that would handle at least 120 percent of the amperage your circuit would handle.
A diode is a perfect short when it is forward biased True or False?
A forward biased diode is not a complete short. Depending on it's design, it will have some forward voltage drop. Silicon diodes normally hafe a drop around .7 V, germanium have a drop around .2V. Some of the newer Schottky diodes fall in between. Selenium diodes have a greater FWD drop.
What diodes are called catching diodes?
It's a diode that is used to limit a voltage to some desired value. Importantly, it's used to limit a transient voltage or an alternative voltage. The simplest example is that diode placed across a relay's inductive coil. As current is cut off through the coil, a large induced voltage appears that can cause damage to the circuit. A diode can be placed in circuit to catch/damp the induced voltage.
What is the meter reading for a forward biased diode is likely to be when using the diode test range of a digital multimeter?
A: Nobody can answer that. It depends on the diode, battery on the meter, scale of the meter. It should never read zero or close to zero ohms and reversing the lead it should just be close to open but it may read some hi k ohms. A meter test is just to find shorted diodes and extremely leaking diode.
What are some practical uses of diodes?
Diodes are largely used for changing AC into DC. A half wave diode bridge will use two diodes for this purpose. A full wave bridge uses four diodes to accomplish this task.See related links below.
What is diode and define some of its applications?
a diode is any electronic device that conducts current significantly better in one direction than the other. it can be a vacuum tube diode, a gas filled tube diode, a point contact semiconductor diode, a junction semiconductor diode, any of several metal oxide diodes, etc.typical applications are:AC power rectifiersAmplitude modulated radio signal demodulators (detectors)Gas filled tube diodes used to be used in certain types of digital counters and computer registersDigital logic gatesSign detection circuits in analog computersVoltage clamps and clippersFrequency modulated radio amplitude limiters to remove static and interferenceetc.
Which type of diode used in bridge rectifier?
You can use most diodes for that purpose, and particularly silicon diodes. However, you should not use zener diodes and similar for rectification purposes. Otherwise, you will likely not get the intended result. If the voltage exceeds the avalanche voltage, then the zener diode will no longer rectify, but conduct the other way as well.
How do you select diode size?
Diodes are usually rated in amperage. A diode may be capable of handling only a 10th of an ampere. Some diodes called Power diodes may be capable of handling up to 100 amperes per diode. To select the proper diode, you must know what the maximum amperage your circuit is capable of. Then you would select one that would handle at least 120 percent of the amperage your circuit would handle.
What does mean by reverse bias diode?
A A diode has two state either on [forward conduction .7 volts. Or reversed bias meaning the diode voltage polarity are revered or cut off, depends on the diode but it will leak some current , Anyhow that is reversed bias diode conditionForward conduction voltage can vary between about 0.6 volts and about 1.4 volts depending on the diode and the current. Also, some diodes, such as zener diodes, will conduct in the reverse direction. Reverse bias is simply where the anode is more negative than the cathode.
A diode is a perfect short when it is forward biased True or False?
A forward biased diode is not a complete short. Depending on it's design, it will have some forward voltage drop. Silicon diodes normally hafe a drop around .7 V, germanium have a drop around .2V. Some of the newer Schottky diodes fall in between. Selenium diodes have a greater FWD drop.
What are diodes Give an example of what a diode does.?
diodes are devices that will conduct electricity in one direction but not the other.diodes are used to rectify AC to make DC in powersupplies.diodes are used to demodulate AM radio signals.diodes are used in some simple AND & OR logic gates.diodes are used in limiter and clamping circuits to set the threshold voltage.etc.some types of diodes are:5Y3, 5U4, Type 80 dual vacuum tube fullwave rectifier power diodes.1B3GT & 5C12P vacuum tube high voltage rectifier power diodes.1N4001, 1N4002, 1N4003, 1N4004, 1N4005, 1N4006, 1N4007 silicon rectifier power diodes.1N914 & 1N4148 silicon small signal high speed gold doped switching diodes.1N34A & 1N60 germanium detector point contact diodes for crystal radios.1N5711 silicon small signal schottky barrier diode.Selenium & copper oxide power rectifier diodes.Galena "cat's whisker" detector diode for crystal radios.etc.there are several special types of semiconductor diodes that are used because of other features besides unidirectional conduction. some are:LED emits light.LASER diode is a tiny LASER.tunnel diode has a negative resistance operating range, allowing use as amplifier.varactor diode is an electrically variable capacitor.zener diode used for voltage regulation and references.etc.
Different between schottky diode and zener diode?
pn junction diode conducts current in one directions where as the zener diode conducts in both the directions. large current flow damage the PN junction diode but zener diode conducts eventhough there is a large current........
What diodes are called catching diodes?
It's a diode that is used to limit a voltage to some desired value. Importantly, it's used to limit a transient voltage or an alternative voltage. The simplest example is that diode placed across a relay's inductive coil. As current is cut off through the coil, a large induced voltage appears that can cause damage to the circuit. A diode can be placed in circuit to catch/damp the induced voltage.
Why zener diode used as voltage regulator?
It has a very sharp reverse breakdown voltage curve and is not damaged by the reverse current, as some normal diodes might be.
Does diode make noise?
There are diode tubes that can make noise, but they have not been popular for a number of decades. The solid-state diodes that you find on printed-circuit boards have no moving parts, so are silent, unless they have been damaged in some way.
Is led a voltage controller or current controller?
An LED is a diode that emits light; diodes allow current to flow only one direction. The voltage applied to the diode attempts to force current to flow in a specific direction. If the voltage polarity is reversed, and current was flowing before (so there was a small voltage drop across the diode), current will cease to flow (assuming the voltage is not too high for the diode to handle), and (almost) all the voltage will be dropped across the diode (a small leakage current may flow, which means some of the voltage will not be dropped across the diode, but this is in the milli or micro range). I would never define a diode as a "voltage controller" or "current controller". It could be either or both, from the above description.
