Why is there a voltage drop across a transistor?

Why is there a voltage drop across a transistor?

When base bias is applied current flows, base to emitter (very small) and collector to emitter, significant. The transistor amplifies the base current. With current flowing through the collector load resistor there is a voltage drop between the supply and the collector.

What is the voltage drop across the collector and emitter of transistor?

When using a transistor as a switch most of the time it’s OK to ignore the 0.2V drop across the collector emitter junction and the 0.7V drop across the base emitter junction in your calculations. Your results will be close enough (especially with the safety margin).

What is the difference between common emitter and common collector?

Common Emitter Configuration – has both Current and Voltage Gain. Common Collector Configuration – has Current Gain but no Voltage Gain.

When the transistor is fully switched off the voltage drop across the transistor VCE is equal to?

Question: When a transistor switch is cut off, Vce is approximately equal to c. 0.2V d. 0.7V When a transistor switch is in saturation, VcE is approximately equal to c. 0.2V a.

Which transistor configuration is used for both voltage and current amplification?

Common emitter transistor configuration
Common emitter transistor configuration Both current and voltage gain can be described as medium, but the output is the inverse of the input, i.e. 180° phase change. This provides a good overall performance and as such it is often the most widely used configuration.

When a transistor is completely turned on how much voltage is dropped across the collector emitter junction?

A general-purpose transistor will drop about . 1 to . 3 volts across the collector/emitter terminals (VCE(sat); see datasheet) when in saturation mode (fully on).

What is collector emitter voltage?

The Collector−Emitter Voltage, VCEO, spec states the maximum voltage that can be applied from the collector to emitter is 50 V. There are two maximum ratings for the input voltage, forward and reverse. The input voltage is defined as the voltage applied from the base and the emitter.

Why common emitter configuration is used for amplification?

⦁ CE is most widely used because it provides the voltage gain required for most of the day to day applications of preamp and power amps. ⦁ Common emitter is the most basic configuration for amplifier circuits. It also provide the maximum transconductance or voltage gain for a given load.

How to connect a bipolar junction transistor in a circuit?

A Bipolar Junction transistor can be connected in a circuit in this three different ways. Common Emitter Configuration – It is the BJT configuration in which it behaves like an amplifier (it has both current and voltage gain). Common Base Configuration – It is the BJT configuration in which (it has Voltage Gain but no Current Gain).

What is the difference between common base and common collector transistors?

Common emitter ( CE) transistor have some advantages over the common base and common collector connection. Common base ( CB) Transistor gives high current gain but low voltage gain. In another side, common collector ( CC) transistor gives high voltage gain but low current gain.

Why does the voltage between the collector and emitter terminals fall?

The reason for this can be seen from the fact that as the input voltage rises, so the current increases through the base circuit. In turn this increases the current thought the collector circuit, i.e. it tends to turn the transistor on. This results in the voltage between the collector and emitter terminals falling.

What is common base and common collector configuration in BJT?

Common Base Configuration – It is the BJT configuration in which (it has Voltage Gain but no Current Gain). Common Collector Configuration – it is the BJT configuration in which it behaves like voltage buffer (It has Current Gain but no Voltage Gain).