when bjt is in cutoff?
233626
Whenever we observe the terminals of a BJT and see that the emitter-base junction is not at least 0.6-0.7 volts, the transistor is in the cutoff region. In cutoff, the transistor appears as an open circuit between the collector and emitter terminals. As is seen in 2, this implies Vout is equal to 10 volts.
404029
['Infinite open-loop gain G = vout / v. ... ', 'Infinite input impedance Rin, and so zero input current.', 'Zero input offset voltage.', 'Infinite output voltage range.', 'Infinite bandwidth with zero phase shift and infinite slew rate.', 'Zero output impedance R.']
1102501
A power amplifier which has low heat generating capacity but without significant high frequency switching distortion may be obtained by controlling the bias voltage to the power transistors in such a manner as to prevent either output transistor from being cut-off below the class B idling current at any time.
625937
Bipolar junction transistors (Also known as BJTs) can be used as an amplifier, filter, rectifier, oscillator, or even a switch, which we cover an example in the first section. The transistor will operate as an amplifier or other linear circuit if the transistor is biased into the linear region.
1015332
Alpha (αdc): It is defined as the ratio of collector current to emitter current. Beta (βdc): It is the current gain defined as the ratio of collector current to the base current. Equations (4) and (5) give the relation between αdc and βdc of a transistor.
848849
When the transistor is operating as an amplifier, the device is operating as a transconductor, a VCCS (voltage controlled current source). When you use a transistor as a switch, it is either fully conducting or fully off. It is still amplifying a small signal, but it's being used to amplify a digital signal.
269463
De hoeveelheid vermogen die je ermee kunt ontwikkelen is afhankelijk van de spanning: Volt x Ampere = Watt. Voor het opladen van een mobieltje is een stroom van 0,5 - 1 A nodig bij een spanning van 5 V, dus ongeveer 2,5 - 5 Watt. Een föhn is ongeveer 500 W, maar aangesloten op 230 V trekt hij maar 500/230=2,2 A.
1038856
In an inductive circuit, voltage drop across an inductor leads the current flowing through it by 90 degrees. We say that phase difference between both parameters is 90 degrees. The same can be seen in the phasor diagram shown.
990888
If the transistor is used in a switching application, the collector voltage will be lower at around 200 millivolts and the hFE was measured to be 52 at 13mA. The collector voltage was adjusted to 200 millivolts using the 1K pot with the DMM measuring voltage across points C and D.
881849
Using 30 as the percentage tuberculin response cut-off for interpreting a QFT test as positive identifies approximately the same number of persons compared with using a TST induration cut-off of 15 mm. The test is considered negative if (mitogen -- nil) > 1.5 IU but (tuberculin -- nil) < 15% (mitogen -- nil).
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RCDs are designed to disconnect the circuit if there is a leakage current. By detecting small leakage currents (typically 5–30 mA) and disconnecting quickly enough (<30 milliseconds), they may prevent electrocution.
1435499
['Measuring the resistance between B1 and B2 terminals. Set your digital multimeter in resistance mode. ... ', 'Reverse biasing the emitter junction. Set the digital multimeter in resistance mode. ... ', 'Forward biasing the emitter junction.']
1404533
Hence, a BJT is current controlled , where as a n FET is voltage controlled. Naturally, you know that a reverse biased diode junction is like a open circuit, showing ideally infinite impedance. So, the reverse biased gate input of the FET is the cause of its high input impedance.
292618
['Assign a reference node (ground).', 'Assign node voltage names to the remaining nodes.', 'Solve the easy nodes first, the ones with a voltage source connected to the reference node.', "Write Kirchhoff's Current Law for each node."]
847865
Every 1dB of loss in the system represent a full 20% -loss- of power. Just as in gain, 3dB of loss represents a loss of 50% of your power.
352357
Note voltage at 15 seconds and stop discharge. If voltage is less than 9.6 (normal temperature), replace battery. Fixed load test—Similar to BCI test except voltage limit depends on CCA rating. ... Many older-model battery testers cannot adequately test AGM batteries and could prematurely condemn a good AGM battery.
1355280
So in one case a moving charge (current) and in other static charge (voltage) controls the output. This happens because in BJT the Base-Emitter junction conducts the charge of control current.