What is the relationship between collector current and base current?

Current-Voltage Characteristics

In forward active mode, increases in base current create increases in collector current according to the relationship I_C = βI_B.

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.

Is base current directly proportional to collector current?

No - the collector current increase does not result from a base current increase - both effects are correlated and are caused by an increase of the base-emitter voltage (which causes the emitter current to increase), see the book "Electronic Devices", as mentioned by Prof. A.

Is collector current greater than base current?

The base current is 10 amps and the collector current is 1ma, so still the base current is much greater than the collector current.

Does the collector base voltage affect collector current?

collector current depends upon the base current and voltage supply(vcc) applied. here base current is constant than collector current depends upon applied voltage. if applied voltage is constant than collector current depends upon load(R) applied between collector terminal and battery voltage.

Common emitter connection | Collector current Formula

Why the collector current is independent of collector to base voltage?

It is because Collector-to-Base junction is reverse biased in the active mode of operation. This reverse biased junction just "passes through" the carriers injected from Emitter into Base and then diffused through Base to Collector.

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.

How many times greater is the collector current then the base current?

This simply means that a change in base current produces a change in collector current which is 44 times as large.

What is the collector current If base is open?

If the emitter-base voltage V_EB = 0, even then, there flows a small leakage current, which can be termed as I_CBO (collector-base current with output open). Hence the above derived is the expression for collector current.

Why collector current is less than emitter current?

In a transistor the collector current is always less than the emitter current because, collector side is reverse - biased and the emitter side is forward biased. a few electrons are lost in the base and only remaining ones reach the collector. collector being reverse biased, attracts less electrons.

What is the relation between currents ie IC and IB of emitter collector and base of BJT?

Since the physical construction of the transistor determines the electrical relationship between these three currents, (Ib), (Ic) and (Ie), any small change in the base current ( Ib ), will result in a much larger change in the collector current ( Ic ).

Which of the following is the correct relationship between base and emitter current of a BJT?

This set of Analog Circuits Multiple Choice Questions & Answers (MCQs) focuses on “BJT DC biasing – Fixed Bias and Emitter Bias”. 1. Which of the following is the correct relationship between base and emitter current of a BJT? Hence, I_E = (β + 1) I_B.

Is Base current equal to emitter current?

The emitter current is equal to the sum of base current and collector current.

Does the collector current increase or decrease if VCC is reduced Why?

If you increase the voltage across the resistor, by increasing Vcc, then the current will increase. If you reduce the resistance value of RC while VCC and VCESAT remain unchanged, then the current will increase.

What effect does increasing collector voltage have on collector current?

It is an exponential relationship that is described by the Ebers-Moll equations. An increase in this voltage results in increased currents in both the base and the collector, and indeed, an increase in base current causes an increase in B-E voltage.

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

When a transistor has zero current through it, it is said to be in a state of cutoff (fully nonconducting). When a transistor has maximum current through it, it is said to be in a state of saturation (fully conducting).

Why is base current small in transistor?

Few electrons injected by the emitter into the base of an NPN transistor fall into holes. Most of the emitter current of electrons diffuses through the thin base into the collector.

Is open-collector sinking or sourcing?

While the NPN open collector transistor circuit produces a “current-sinking” output, that is the NPN transistors open collector terminal will sink the current to ground (0V), a PNP-type transistor can also be used in an open collector configuration to produce what is called a “current-sourcing” output.

What happens to the collector current if the emitter current increases while no base voltage is applied?

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.

What is the most important fact about the collector current?

What is the most important fact about the collector current? It is measured in milliampere. It equals the base current divided by the current gain.

What is gamma of a transistor?

Gamma: It is defined as the current gain in common collector configuration and it is the ratio of emitter current (output current) to base current (input current) It is also defined as how much current is injected from the emitter to the base after the recombination of minority charge carriers in the base.

What is IB in a transistor?

The base current, IB, of a transistor is a crucial current of a bipolar junction transistor. Without this base current, the transistor can't turn on.

What is the relation between α and β?

β=1−α

What factor defines the relationship between collector and emitter currents?

Generally, the current that flows from the emitter to the collector or vice versa is the base current times the DC current gain (h_FE).

What is the voltage difference between collector and emitter?

A small voltage drop will form between those nodes. Transistor datasheets will define this voltage as CE saturation voltage V_CE(sat) -- a voltage from collector to emitter required for saturation. This value is usually around 0.05-0.2V.