p-n Junction

Explain, with the help of a circuit diagram, the working of n-p-n transistor as a common emitter amplifier.

Consider a p-n junction diode having the characteristic \[i -  i_0 ( e^{eV/kT}  - 1) \text{ where }  i_0  = 20\mu A\] . The diode is operated at T = 300 K . (a) Find the current through the diode when a voltage of 300 mV is applied across it in forward bias. (b) At what voltage does the current double?

Find the currents through the resistance in the circuits shown in figure. 

(Assume that the resistance of each diode is zero in forward bias and is infinity in reverse bias.)

Calculate the current through the circuit and the potential difference across the diode shown in figure. The drift current for the diode is 20 µA.

Each of the resistance shown in figure has a value of 20 Ω. Find the equivalent resistance between A and B. Does it depend on whether the point A or B is at higher potential?

Find the current through the battery in each of the circuits shown in figure.

(Assume that the resistance of each diode is zero in forward bias and is infinity in reverse bias.)

What are the readings of the ammeters A₁ and A₂ shown in figure. Neglect the resistance of the meters.

(Assume that the resistance of each diode is zero in forward bias and is infinity in reverse bias.)