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Is transistor variable resistor?
Yes, a transistor is like a variable resistor, in that the resistance between collector-emitter or drain-source is variable. It’s like a valve, and either allows current to flow or blocks it from flowing.
Is transistor a 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.
How Mosfet can be used as voltage controlled resistor?
In Figure 5 , MOSFETs have also been used as voltage controlled resistors. Because most MOSFETs today tend to be “enhancement mode” , this means that the required biasing at the gate is a positive voltage to turn on the drain current to lower its Rds . Thus, if the gate voltage is 0 volts, the MOSFET is turned off.
What is the difference between a resistor and transistor?
Transistor: A transistor is an electronic device used to control the flow of an electric current. Resistance: The resistor is an electronic component that limits or limits the current flow and divides the voltage in an electronic circuit. Its main purpose is to provide a precise amount of electrical resistance.
Can a resistor be used as a transistor?
The circuit I have is very simple; it consists of a 20Vpp-sinusoidal source connected to a resistor (100 M to 700 M Ohm) then to ground. However, I want to replace the resistor with an NMOS transistor such that the circuit behaves in a similar manner.
Why do we use a base resistor in a PNP transistor?
The short answer is that this is a “base resistor” that we use to limit the maximum current that flows through the base of the PNP transistor. But, let’s take a look in a little more detail, and see what would happen if we didn’t have that there.
How to calculate the base resistor of a BJT?
The formula for calculating the base resistor of a BJT can be seen below: R = (Us – 0.6).Hfe / Load Current, Where R = base resistor of the transistor, Us = Source or the trigger voltage to the base resistor, Hfe = Forward current gain of the transistor.
How is the base of a transistor held low?
When a logical input to the SN7407N is high, the output of its internal NOT gate is low. Since the output of the NOT gate is connected (through a resistor) to the base of the internal NPN transistor, the base of the transistor is held low.