Consider a Common Emitter amplier circuit, there'll be two inputs present in which one is applied at the base of the transistor[input voltage] and other at collector[supply voltage,+Vcc]

I want to know 1)what is difference between that two voltages ?
2)need to use both in the same circuit?
3)why input voltage of AC and the supply voltage is DC?


Help me please...

This is homework, and should be handled of in the homework department.
But I'll give you some hints to answer your own question :

First you have to understand what is a Common Emitter amplifier circuit, and what the specfics of such a circuit are.

"there'll be two inputs present in which one is aplied at the base of the transistor[input voltage] and other at collector[supply voltage,+Vcc]"

Incorrect : at transistor A base the input voltage is applied. At the other transistor B base is a dc voltage for control. The common emitter transfers the signal from one transistor to the other over the resistor R to earth. Collector A is connected to supply. Output is at collector B, over resistor RC.

Draw this out : make a circuit diagram as I described. LEARN what is where and WHY it operates they way it does.

Success !

:)

This is homework, and should be handled of in the homework department.
But I'll give you some hints to answer your own question :

First you have to understand what is a Common Emitter amplier circuit, and what the specifics of such a circuit are.

"there'll be two inputs present in which one is aplied at the base of the transistor[input voltage] and other at collector[supply voltage,+Vcc]"

Incorrect : at transistor A base the input voltage is applied. At the other transistor B base is a dc voltage for control. The common emitter transfers the signal from one transistor to the other over the resistor R to earth. Collector A is connected to supply. Output is at collector B, over resistor RC.

Draw this out : make a circuit diagram as I described. LEARN what is where and WHY it operates they way it does.

Success !

:)