Table of Contents
Do transistors change resistance?
This is why although a transistor has a defined V and I, and their ratio has units of resistance, we do not say that it has a resistance, because it will be measured differently by different resistance-measuring devices. Two current measuring devices will give substantially the same reading as each other.
What is the difference between different transistors?
Both PNP and NPN transistors are composed of different materials and current flow of these transistors is also dissimilar. In an NPN transistor, the current flows from the collector (C) to the Emitter (E), whereas in a PNP transistor, the current flows from the emitter to the collector.
What is the resistance of a transistor?
Yes the simplest method to figure out the equivalent resistance is to measure the collector voltage Vc and the emitter voltage Ve and subtract: V=Vc-Ve, and then measure the current through the collector Ic. The approximate resistance (neglecting the base current) is: R=V/Ic.
Why are there different transistors?
Based on their properties and characteristics, some transistors are primarily used for switching purpose (MOSFETs) and on the other hand, some are transistors are used for amplification purpose (BJTs). Some transistors are designed for both amplification and switching purposes.
Is transistor A variable resistor?
A transistor within an electronic circuit works like a combination of a diode and a variable resistor, also called a potentiometer or pot. When forward voltage is applied to the diode, the knob of the magic pot turns much like the needle on a voltmeter. …
Is transistor a non-ohmic resistance?
A light bulb is a common example of a non-ohmic conductor. Other examples of non-ohmic conductors are diodes and transistors.
What is transistor explain different types of transistor?
A transistor is a semiconductor device used to amplify or switch electronic signals. Transistors are broadly divided into three types: bipolar transistors (bipolar junction transistors: BJTs), field-effect transistors (FETs), and insulated-gate bipolar transistors (IGBTs).
Why are NPN transistors more commonly used than PNP transistors?
As the electrons have higher or faster mobility than holes, the conductivity also more. For this reason, NPN transistors are more preferable than PNP transistors because the NPN transistor provides more conductivity. We know that in electronic circuits all the negative(-ve) or common terminals are grounded.
Does transistor have resistance?
Is transistor and ohmic resistance?
So, diodes are non-ohmic resistances. A transistor itself means ‘trans’ ‘resistance’ which means variable resistance. So, the only material which obeys ohm’s law in the given options is copper wire.
Why emitter is heavily doped in transistor?
In most transistors, emitter is heavily doped. Its job is to emit or inject electrons into the base. These bases are lightly doped and very thin, it passes most of the emitter-injected electrons on to the collector. The collector is so named because it collects electrons from base.
Can transistor be used as a resistor?
MOS transistor is used as a load resistor in digital circuits. MOSFET is used as a resistor and can also be used by you in the bridge circuit. The ON-state is reasonable linear and there is no current flow through the gate under steady state (as it is a Voltage controlled device).