## What is current gain of a transistor?

Current gain is the ratio of the change in the collector current to the change in the emitter current in a transistor. Mathematically α=△Ic△Ie.

How do you find the current gain in a common base transistor?

The current gain for a CB configuration is called Alpha, ( α ). In a BJT amplifier the emitter current is always greater than the collector current as IE = IB + IC, the current gain (α) of the amplifier must therefore be less than one (unity) as IC is always less than IE by the value of IB.

### What is base current in transistor?

Base current is typically 1% of emitter or collector current for small signal transistors. Most of the emitter electrons diffuse right through the thin base (c) into the base-collector depletion region.

What is the current gain of common base transistor amplifier?

The current gain of a transistor in CB configuration is defined as the ratio of output current or collector current (IC) to the input current or emitter current (IE). The current gain of a transistor in CB configuration is less than unity. The typical current gain of a common base amplifier is 0.98.

## What is meant by current gain in the BJT?

In a Bipolar Junction Transistor (BJT), the current gain β is defined as the ratio of change in collector current to change in base current for constant collector voltage in collector-emiitter configuration.

How is current gain calculated?

The current gain for the common-base configuration is defined as the change in collector current divided by the change in emitter current when the base-to-collector voltage is constant.

### What is formula for gain of transistor in current amplifier?

The Common Emitter Amplifier Circuit 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.

Why base current is electron current?

As electrons are injected from E to C, while passing through the base a small number recombine with holes. This results in a small net flow of current out of the base due to the inflow,of holes.

β=1−α