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due to minority carriers
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When emitter is open and the collector junction is reverse biased still a very small current flows in the circuit why?
Most transistors and diodes exhibit reverse bias leakage.
What is reverse saturation current in ideal diode?
When a pn junction is reversed bias practically no current flows through it ,but a very small current flows through due to minority charge carriers ,which is known as reverse saturation current .In p type due to electrons and in n type due to holes .
Why there is no current in reverse bias condition?
Current flows in a reverse biased diode because diodes are not ideal. They do have leakage current and a breakdown voltage in reverse, just as they have a breakdown current in forward and a non-linear and non-parallel forward voltage to current curve. It is also possible that you are looking at a zener diode. A zener diode is specifically design to conduct at a certain voltage in reverse.
What is saturation in current in diod?
When a pn junction is reversed bias practically no current flows through it ,but a very small current flows through due to minority charge carriers ,which is known as reverse saturation current .In p type due to electrons and in n type due to holes .
Reverse polarity in welding?
Immediate and catastrophic destruction of transistors and/or diodes. While that does not ALWAYS occur, it's certainly possible. Start with the alternator. No doubt those diodes have been destroyed if a battery has been connected with reverse polarity.
When emitter is open and the collector junction is reverse biased still a very small current flows in the circuit why?
Most transistors and diodes exhibit reverse bias leakage.
Difference between diode and zener diode?
All diodes have a tiny voltage when current flows in a 'forward' direction. And a Reverse Breakdown voltage when current tries to flow in a reverse direction resulting in a high voltage. That current does not flow until voltage exceeds its breakdown number. Regular diodes have a reverse breakdown voltage that is somewhere above a number, For example a 1N4002 has a Reverse Breakdown Voltage somewhere above 100 volts. A Zener diode is constructed so that its Reverse Breakdown voltage is clearly defined and accurate. For example Reverse Breakdown voltage for a 1N4733 is 5.1 volts. A !N4734 is 5.6 volts.
Why do diodes allow current in one way only?
Forward Bias Condition: Diode allows only one way direction, the reason for majority carriers flows to minority carrier. higher to lower that's it. Reverse Bias Condtion: Reverse direction also flows the current, That is Leakage current. it should be minimun for good diode. For Practical Example: See field work.
What will happen if a diode is connected to capacitor?
the diode when forward biased will conduct and during reverse biased condition(generally doring reverse biased condition ckt is open mens no current flows;when register is connected)current flows but during reverse biased condition 1--for sometimes initially current flows due to discharging of capacitor. 2--then ckt will be having no current
Define reverse saturation current?
In diode some current flows for the presence of the minority charge carriers. This current is known as reverse saturated current. This is generally measured by picoampere. This current is independent of reverse voltage. It only depends on the thermal excitation of the minority carriers
What is reverse saturation current in ideal diode?
When a pn junction is reversed bias practically no current flows through it ,but a very small current flows through due to minority charge carriers ,which is known as reverse saturation current .In p type due to electrons and in n type due to holes .
Which would be the anode?
Basically anywhere where current flows in and out of a device - but the term is typically used for certain devices such as batteries, electrolytic cells, diodes, and others.
Why there is no current in reverse bias condition?
Current flows in a reverse biased diode because diodes are not ideal. They do have leakage current and a breakdown voltage in reverse, just as they have a breakdown current in forward and a non-linear and non-parallel forward voltage to current curve. It is also possible that you are looking at a zener diode. A zener diode is specifically design to conduct at a certain voltage in reverse.
What happens to leakage current of the diode when temperature changes?
The reverse-biased leakage of a diode is due to to two things. One, a physical property of the diode known as free-carrier recombination. The electrons and positrons which exist near the p-n boundary are constantly re-combining. This creates a fixed current known as the saturation current. If the diode is reverse biased, then the saturation current flows in the external circuit. Two, contamination in the diode causes a current which is like a resistor connected in parallel with the diode. A good rule of thumb is that the total reverse-biased diode leakage current (One + Two) will double every 10 degrees C. For the very best diodes, with tiny leakages, search for the forum comments of Dr. Winfield Hill on the topic of very clean diodes with ultra-low leakage.
What is saturation in current in diod?
When a pn junction is reversed bias practically no current flows through it ,but a very small current flows through due to minority charge carriers ,which is known as reverse saturation current .In p type due to electrons and in n type due to holes .
What is the difference between rectifier diode and zener diode?
A: They are both diodes. The difference lies in the application. A rectifier is used to rectify AC current into pulsating current. The zener diode is used to regulate a voltage source to the zener voltage when connected in the reverse direction. ************************************************************** If you look at the characteristic curves of a rectifier diode and a zener diode, you will see that they are similar, but the reverse curve of the zener has a much sharper bend at what is called the "knee". It is at this point on the zener's curve at which it operates.
When flow can reverse its direction regularly it is called?
Alternating Current (AC) reverses its flow constantly, unlike DC (constant current) which flows in one direction only.
