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How many junctions does a Field Effect transistor have?
1
What are the distinguishing features of an n-channel JFET from a p-channel JFET?
diff. that in n channel & p channel two p type slab in fabricated n type semiconductor & vice -versa
Two resistors are connected in a series how does the current through the second resistor compare to the current through the first resistor?
Let us look at a black box with two external terminals and the black box is composed of only passive elements. Conservation of charge means that what goes in one terminal has to exit the other terminal, or else electrical charge will accumulate or deplete inside the black box. Current is just charge per unit time. Current going in one terminal has to exit without loss the other terminal. Resistors are passive element. In this situation, we have two black boxes, each is composed of one resistor. What goes in = what comes out --> the current is the same in both resistors.
How many things are needed to create a current?
A difference of potential (voltage) and a conductor connected to the voltage source will cause current flow. Not that you'd want to "short out" a voltage source with a piece of wire, but just the source of voltage and the conductor would permit current to flow. If you took a piece of wire and touched it to the terminals of a good battery, current would flow. It takes just those two things to create a current.
Why an independent voltage source is deactivated by short circuiting it?
A voltage source (V) is modeled by connecting its internal impedance (Zg) in series. If we determine the impedance across the voltage source terminals, it should be Zg, and it is possible only if the voltage source is short-circuited.An equivalent current source is modeled by connecting the current source (V/Zg) in parallel with the internal impedance Zg. For the two sources to be equivalent, their impedances across their terminals must be equal. This is possible only if the current source is open-circuited.
How do you identify drain and source in a JFET using multimeter?
step one. put down multimeter. step two. google the JFETS serial number step three. click the link that looks like a datasheet. step four. find the pin configuration. Probably alot easier than finding which two have low resistance when you apply voltage to the gate (assuming N type)
What is an electric current and how does it flow through a circuit?
An electric current is the flow of electric charge through a conductor. In a circuit, the current flows from the positive terminal of the power source, through the components in the circuit, and back to the negative terminal of the power source. This flow is driven by the voltage difference between the two terminals, creating a continuous loop of electricity.
What are independent and dependent sources?
An independent source is a source that produce constant currents and voltage. Dependent sources are voltage sources that depend on a voltage somewhere else in the network.
Difference between de-mosfets e-mosfets and jfets?
The basic theory of operation is the same, but the device structure is different. With both a MOSFET and a JFET, a conductive channel is established between two terminals (the drain and the source). The structure of the gate terminal makes the difference between the two. In a MOSFET, the metal gate is separated from the channel by an insulator (the O in MOSFET means Oxide, the insulator). In a JFET the gate is a doped region essentially within the conductive channel.
How many junctions does a Field Effect transistor have?
1
Why is n channel JFET preferred to p channel JFET?
The mobility of N type charge current carriers is more than two times greater than the mobility of P type charge carriers . Resulting in faster transistor operating speed .
Difference between jfet and mosfet?
hi Main differences are, Bipolar Junction Transistor: switching speed is low;switching loss is more; conduction loss is less; frequency of switching is less we can use as amplifier;Current control; conduction due to electron & holes Junction field Effect Transistor: it an unipolar; switching speed is high;so loss is less voltage control; Metal oxide semiconductor fet: it nothiug bt fet, most of time v used for switching device in Smps do to power range A BJT is a bipolar transistor in the sense that there are two types of charge carriers in them. In npn trnsistor the primary carrier in the hole and in pnp the electron. In JFET there is only one type of carrier. In n-channel case the carrier is elctron and in p-channel hole. So JFET is unipolar in that sense. BJT is a current controlled device as the input current is amplified subjected to the mode of operation. For example in CE mode the input current is base current and output current is emmiter current which is (β+1) times amplified. The drop of this current across the load voltage is the output signal voltage. But a JFET is a voltage controlled device. The chalnnel conductance is determned by the voltage supplied at the gate terminal and depending on this the drain current flows. MOSFET is one kind of voltage controlled device like JFET where there is metal oxide in between the gate and the channel. Depending on the voltage supplied on the gate terminal a voltahe is 'induced' by electrostatic induction in the isolated channel. The channel therefore behaves as a capacitor where due to the voltage some charges are induced. These charges shrink or extend the effective chanel width. For example in Enhancement Mosfet the channel width effectively increases and in depletion mosfet it decreases. Depending on this the drain to source current increases or decreasesA BJT is a bipolar transistor in the sense that there are two types of charge carriers in them. In npn trnsistor the primary carrier in the hole and in pnp the electron. In JFET there is only one type of carrier. In n-channel case the carrier is elctron and in p-channel hole. So JFET is unipolar in that sense.
What are the characteristics of bipolar junction transistor?
A Bipolar Junction Transistor(a.k.a. a BJT or BipolarTransistor) is an activesemiconductor deviceformed by twoP-N junctionswhose function is amplification of an electriccurrent.
How does electric current flow in the b connection?
Electric current flows in the b connection due to the movement of electrons from the negative terminal to the positive terminal of the power source. This flow of electrons creates a closed loop circuit, allowing the current to pass through the b connection and power the device or component it is connected to.
In a battery current flows from which terminal to which terminal?
Strangely there is two directions it is said to flow.The first and wrong is conventional current that is positive to negative. WRONG. Several hundred years ago people guestElectron current is the direction it actually goes in. This is negative to positive.
How can convert voltage source into current source?
Take the internal series resistance of the voltage source and make it the internal parallel resistance of the current source. Then compute using Ohm's law the current of the current source to be equal to the maximum current the original voltage source could supply a short circuit load. Note: the two sources are equivalent.
What are the distinguishing features of an n-channel JFET from a p-channel JFET?
diff. that in n channel & p channel two p type slab in fabricated n type semiconductor & vice -versa
