why is n-p-n transistor preferred over p-n-p transistor???

why p and n type semiconductors are electrically neutral?

which of the two, an a ammeter or a milliameter, has a higher resistance and why????

what is pn junction diode  and its  working

 explain the working of a common emmiter npn transistor amplifier?

what is drift current and diffusion current plz explain

How does transistor act as an amplifier....???

plzzz explain the diagram also....plzz

what is mean by potential barrier and depletion layer.

What is current amplification factor???

 plz explain input and output characteristics of transistor

 Why does heavy doping in a Zener diode lead to a thin Depletion layer ?

effect of temperature on intrinsic semiconductor

explain transistor as a switch

Compare the energy band digram of conductors, insulators and semiconductors.

Explain zener diode?