When the collector current in a transistor is zero the transistor?

The switched (controlled) current goes between the collector and emitter. The controlling current goes between the base and emitter. When a transistor has zero current through it, it is said to be in a state of cutoff (fully nonconducting).

What happens when the collector current is zero?

If there is no base current, then the collector current would be zero as well. Under this condition, there is no current in any of the junctions, and therefore all junction voltages are zero.

What happens when the base current of a transistor is zero?

If the base current is zero, the collector current is zero. When transistor is in cutoff region both the junctions are reverse biased and transistor becomes an open circuit.

What happens when a transistor is saturated?

Saturation -- The transistor acts like a short circuit. Current freely flows from collector to emitter. Cut-off -- The transistor acts like an open circuit. No current flows from collector to emitter.

How do you know if a transistor is saturated?

You can conclude the operation of a transistor if it is saturated or not by doing actual measurement. Monitor the collector-emitter voltage of your circuit with a DMM. If the reading is below 0.3V, the transistor is at saturation.

Current in a Transistor | Electronics

What is collector saturation current?

Saturation collector current refers to the collector current value beyond which the relationship between the base and collector current is no longer linear (i.e. independent of the DC current gain beta).

What is collector cutoff current?

Collector cutoff current is the IC that still flows when the specified VC and a specified reverse bias is applied. It is normally less than either ICEO or ICER (collector current with the base open, or with the base resistively connected to the emitter).

What is saturation current in transistor?

Saturation of the bipolar transistor means that a further increase in the current base does not occur (almost) the increase in the collector current (emitter in reverse mode). This mode can not be called wrong. In some cases (switching circuit) or transistor in saturation or closed.

When the transistor is in saturation the collector to emitter voltage is?

A transistor in saturation would be at the bottom left corner. By "Saturation voltage" they mean the collector to emitter voltage under the given conditions. Usually it is with a forced beta of 10 or 20.

When a transistor is driven into saturated its collector voltage is?

In a standard saturated transistor, the base-to-collector voltage is 0.6 V. In a Schottky transistor, the Schottky diode shunts current from the base into the collector before the transistor goes into saturation.

When the base current of a common emitter transistor is kept at zero it operates in?

When the base current or input current I_B = 0 μA, the transistor operates in the cut-off region.

Why does collector current increase with base current?

Collector Current

It increases for larger emitter currents because the larger number of electrons injected into the base exceeds the available holes for recombination so the fraction which recombine to produce base current delines even further.

When a CE transistor is cut-off?

If the transistor is cut-off, there is no base current, so there is no collector or emitter current. That is collector emitter pathway is open [See Below Fig.] (ii)]. In saturation, the collector and emitter are, in effect, shorted together.

What is the zero signal?

The live-zero signal is a standard signal that serves as a current or voltage signal for the analog transmission of a process variable to the PLC, for example.

What is Alpha Beta Gamma in transistor?

A transistors current gain is given the Greek symbol of Beta, ( β ). As the emitter current for a common emitter configuration is defined as Ie = Ic + Ib, the ratio of Ic/Ie is called Alpha, given the Greek symbol of α. Note: that the value of Alpha will always be less than unity.

Which transistor is used as switch?

Both PNP and NPN transistors can be utilized as switches. A basic terminal transistor can be handled differently from a signal amplifier by biasing both NPN and PNP bipolar transistors by an “ON / OFF” static switch. One of the main uses of the transistor to transform a DC signal “On” or “OFF” is solid-state switches.

What happens when the collector current is increased in a transistor?

As the temperature of a transistor increases, the collector current will increase because: Intrinsic semiconductor currrent between the collector and base increases with temperature. Its flow through the biasing resistors drives the base more positive, increasing forward bias on the base-emitter diode.

When the transistor is in saturation the collector to emitter voltage is Mcq?

Explanation: At saturation, the collector-to-emitter voltage is the minimum drop possible occurring due to the non-zero internal resistance of the BJT. Since it cannot decrease further, the current I_C cannot increase further. The BJT is said to be saturated.

What happens to the collector current if the emitter current rises without the use of a base voltage?

Explanation: When no voltage is provided at the base then no current passes from emitter to collector, so even if very high potential difference is applied at the emitter collector junction, no current flows through it.

Why is it called saturation current?

The maximum value of the photoelectric current is called the saturation current. Saturation current implies that all the photoelectrons emitted by the emitter are immediately collected by the anode.

What does saturation current depend on?

The value of saturation current depends on intensity. It is independent of stopping potential.

What is active mode in transistor?

A transistor is said to be in its active mode if it is operating somewhere between fully on (saturated) and fully off (cutoff). Base current regulates collector current. By regulate, we mean that no more collector current can exist than what is allowed by the base current.

What does cut off current mean?

In electronics, cut-off is a state of negligible conduction that is a property of several types of electronic components when a control parameter (that usually is a well-defined voltage or electric current, but could also be an incident light intensity or a magnetic field), is lowered or increased past a value (the ...

What is emitter base cutoff current?

The dc current into the emitter terminal when it is biased in the reverse direction with respect to the base terminal and the collector terminal is open-circuited.

What is saturation voltage?

saturation voltage, collector-emitter (VCE(sat))

The voltage between the collector and emitter terminals under conditions of base current or base-emitter voltage beyond which the collector current remains essentially constant as the base current or voltage is increased.