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The key function of a diode is to control the direction of the flow of current. Current passing through a diode can only go one way, which is called forward biased. In this setup, current is continuous hence the circuit is closed. When there is no current passing through, there will be no flow, and this is called reversed biased. In such a case, current is not continuous, hence it is called open circuit.
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What is the purpose of a diodes in a circuit?
a diode in a ckt basically acts like a switch!! it acts like a switch in on position i.e a short when forward biased and acts like a open ckt or a swich in off position when it is reversed biased!! its used inanalog circuits to generate different types of waves.........
What is a device made of semiconductor material that acts like a switch controlling the flow of electrons in a chip?
if a diode is in forward biased the diode acts as switch is on and when we apply the diode in reverse biased then it work as the switch as off.
Zener diode with its forward biase?
acts like a normal diode in forward biased condition
How does a zener diode work in forward bias?
Like a normal diode............. unless it includes a "back biased" diode to prevent conduction in this mode as is common in zener diodes rated at about 10 volts or more, then it acts as an open circuit.
When both junctions of npn diode are reverse biased?
When p-n junction of a diode reversed biased then majority carriers are not able to cross the junction and are attracted in respective regions.So current becomes approximately zero.But because of minority carriers a reverse current keeps flowing.It is called Reverse Saturation Current.And due to attraction towards sides,charges go away from junction.So width of depletion reason increases.
When biased correctly a zener diode acts as?
a diode and it has a constant voltage across it ANSWER: acts as a voltage regulator if enough current flows to create a breakdown voltage.
How does diode acts as a switch?
When the diode is reversed biased (positive charge applied to the N side and the negative charge applied to the P side) no current can flow just like when a switch is off. When the diode is forward biased (positive charge applied to the P side and the negative charge applied to the N side) no current can flow just like when a switch is on. Current can only flow in one direction.
When does diode acts as resistance?
When it is forward biased and, in the case of a zener diode, when it is reverse biased as well. It just is not a linear resistance type of device, and the apparent resistance changes as a function of the applied voltage or current.
Why the negative half cycle cannot pass through the diode?
When the diode is reverse biased a depletion zone is formed at the junction between the cathode and anode, that lacks current carriers (it has neither electrons or holes). Without current carriers, the diode acts as an open circuit, blocking current flow.
What is the function of a diode in a circuit?
The most common function of a diode is to allow an electric current to pass in one direction (called the forward biased condition) and to block the current in the opposite direction (the reverse biased condition).
How do clamping and clipping circuit works?
A Limiter , by the action of a diode and its biasing will pass signals to its out put. A positive limiter will completely limit the positive portion of an AC waveform. A Negative Limter will limit the negative portion of a wave form. To truelly understand this concept, you must fully understand diodes and how they are Forward Biased and Reversed Biased. When A diode is Forward Biased, meaning that the Anode is more positive than the Cathode, the diode acts as a short and when a diode is reversed biased, it will act as an open, no current flow. A juntion diode by design will only allow current to flow from cathode to anode. A Clamper circuit uses a capacitor, resistor and a diode to fix an ac waveform to a DC level. This is accomplished by the quick charging of a Capacitor through a diode but the discharge path is through a large resistor. Due to RC time contants, the capictor is not geven enough time to discharge befor the next charge arrives thus acting as a voltage doubler. TC= Time Contant = Resistance in Ohms times the Capacitance in Farrads that is measured in seconds. It takes 5 TC's to fully charge. By adding a DC Bias, we are now able to set a newclamping point other that the 0 Volt reference.
Is it necessary to add a series resistance with the diode or not?
if the diode is forward biasedwell practically the current flows in a circuit if and only if an effective resistance is present in the circuit, if we consider the diode to be ideal (barrier potential but no internal resistance) in this case an external resistance is required if we use the approximate model (both barrier potential and internal resistance are considered) we need not use an external resistance the internal resistance itself acts as the effective resistance.if the diode is reverse biased:-the same explanation applies even if the diode is reverse biased but one must take care that the reverse voltage drop on diode should not increase the peak inverse voltage mark the diode would be burnt or damaged if this phenomena occurs.So this can be prevented by adding suitable resistance to the circuit through which the voltage drop on diode can be managed
