Does the emitter to base junction have forward or reverse bias?

Does the emitter to base junction have forward or reverse bias?

In typical operation, the base–emitter junction is forward-biased, which means that the p-doped side of the junction is at a more positive potential than the n-doped side, and the base–collector junction is reverse-biased.

Is the device which acts like an NPN and a PNP transistor connected base to base and emitter to collector?

Right Answer is: D An SCR – Silicon controlled rectifier is 4 layered solid-state current controlling device. The operation of SCR is similar to a PNP and NPN transistors connected base to collector and emitter to base.

What will happen if we replace NPN transistor with PNP and give supply as it is?

The biasing resistors remain the same. Assuming you connect the pin labeled emiiter, base and collector the same, then the transistor would play dead. Without the 0.7 volt. bias on the base, no current can flow.

Can you convert PNP to NPN?

If you have the exact NPN equivalent you only need to mount the circuit as it is drawn, so that the base, collector and emitter terminals of the NPN are connected where base, collector and emitter of the PNP should go, and then reverse the power supply polarity.

Which is more positive base or emitter in NPN transistor?

Here, Emitter-Base junction is forward biased and Collector-Base junction is reverse biased. That is, for a NPN transistor, Base is more positive with respect to Emitter and Collector is more positive with respect to Base.

How does a PNP transistor work in reverse?

A PNP transistor behaves like an NPN transistor in reverse. If the emitter-base voltage is less than the PN junction forward-bias voltage which is about 0.5V, the transistor will be cut off and no current flows from emitter to collector.

When does a PN junction turn off a transistor?

If the emitter-base voltage is less than the PN junction forward-bias voltage which is about 0.5V, the transistor will be cut off and no current flows from emitter to collector. When the emitter-base voltage is large enough to turn on the PN junction, a small current will flow from the emitter to the base.

How are collector base junction and emitter base junction reverse biased?

In this mode, both collector base junction and emitter base junction are reverse biased. As both the PN Junctions are reverse biased, there is almost no current flow except small leakage currents (usually in the order of few nano amps or pico amps).