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Can a silicon diode be forward biased if the anode voltage is negative?
Wiki User
∙ 8y ago
To be forward biased any diode (e.g. vacuum tube, crystal, junction, point contact) must have its relative anode voltage more positive than its cathode voltage.
If the absolute anode voltage is negative but the cathode voltage is even more negative, then the diode will be forward biased. But as your question made no mention at all of the cathode, I cannot tell if this is the case or not.
Wiki User
∙ 8y ago
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What is the forward biased knee voltage for a 1n4001 silicon diode?
A; The 1N4xxx series of rectifier diodes are specified as 1 amp forward conduction. the last number signify the maxi mun reverse voltage it can sustain without breakdown.
How much voltage is there across a germanium diode when it is forward biased?
About 0.2V
Why are silicon diodes not suited for low voltage rectifiers?
Silicon diodes ARE used in reverse bias. This is the mode in which they do not conduct, which is the principal role of a diode. When forward biased, a silicon diode will conduct but has a voltage drop of around 0.6v so is not useful for rectifying small voltages (unless used as a perfect diode with an op amp).
What are the vi characteristics of ideal diodes?
Zero current flow when reverse biased, zero voltage drop when forward biased.
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.
How much voltage is there across a silicon diode when it is forward biased?
0.7 The voltage across a silicon diode when it is forward biased should be greater than or equal (>=) 0.7volts.
Why is the current nearly zero at a voltage less than 0.4 v in a forward biased silicon diode?
The current is nearly zero at a voltage less than 0.4v in a forward biased silicon diode because of the small forward-bias voltage.
If the cathode voltage of a forward biased silicon diode is 4.5 v what is the anode voltage?
The nominal forward bias voltage of a silicon diode is 0.7V, depending on current and temperature. If the cathode is 4.5V, the anode should be around 5.2V.
What is the forward biased knee voltage for a 1n4001 silicon diode?
A; The 1N4xxx series of rectifier diodes are specified as 1 amp forward conduction. the last number signify the maxi mun reverse voltage it can sustain without breakdown.
What happend when a diode is forward biased?
The diode conducts at its forward breakdown voltage. Depending on the current, and the type of diode, the voltage could be anywhere between 0.2 and 3.5 volts, with a nominal silicon range of 0.7 to 1.4.
Approximate voltage across the forward-biased base emitter?
The approximate voltage across the forward-biased base-emitter junction is 0.7 volts.
What do you mean by DC forward voltage?
DC forward voltage is generally related to diodes. It means the voltage across the diode when the diode is forward biased, i.e. when the anode is more positive than the cathode. The forward voltage is the drop across the diode. The amount of drop is a function of current. For typical silicon diodes, the forward voltage drop ranges from 0.6 volts for very small currents, to 1.5 or more volts for large currents.
Why the n-jfet is operated with the negative voltage not the positive voltage?
In a JFET the only insulation between the gate and the channel is a reverse biased diode junction, if this junction becomes forward biased then the gate and channel are effectively shorted and the device no longer acts as a transistor (it will act as a forward biased diode instead). In the n-channel JFET, the gate is the P-side of this diode and the channel is the N-side of this diode. To keep this diode reverse biased (and the device operating as a transistor) therefor the gate MUST always be maintained at a voltage more negative than the most negative section of the channel.
When a diode is properly forward biased what is the voltage drop across it equal to?
The forward biased voltage drop of a diode depends on the type of diode and the current through the diode. A typical silicon diode will exhibit a voltage drop between 0.6v and 1.4v depending on current. An LED might range from 2v to 3v. A germanium diode might go a low as 0.2v. Bottom line; it varies.
What is a barrier voltage?
The voltage across a forward-biased PN junction in a semiconductor diode or transistor.
How much voltage appears across a zener diode when it is forward-biased?
That depends on the zener voltage rating:"low voltage" zeners are just a simple single diode, the zener diode"high voltage" zeners contain 2 back to back diodes in one package, the zener diode and an ordinary diode that is reverse biased when the zener diode is forward biased to block forward conduction of the zener and protect it from overcurrent damage if installed backwards by mistakeThus in "low voltage" zeners when forward biased they will have a normal diode drop (e.g. 0.7V), but "high voltage" zeners when "forward biased" they will act open due to the reverse biased blocking/protection diode in series with the zener.
Can you call forward bias voltage as positive voltage?
it is not necessary that always positive voltage should act as a forward bias voltage , it is the potential difference between cathode and anode that makes it forward or reverse biased .it the anode(p- doped material) positive with respect to cathode(n- doped material) --> forward biasedit the anode(p- doped material) negative with respect to cathode(n- doped material) --> reverse biasedex.anode - 5v cathode - 3vanode - 1v cathode - -2vboth the examples are forward biased.
