In my textbook there are no voltage dependent sources.The diagram is just same as figure 6 in your first link but it has simple battery symbols for voltage sources.

In the link you are referring to, you will notice that in the models for the transistor that there is a diamond shaped symbol in the collector loop. This symbol represents a current controlled current source. As you may already know, the collector current in a BJT transistor is related to the base current by the dimensionless factor referred to as beta. This current controlled current source is included in the model to account for that relationship.

hgmjr

 

If we put a simple battery symbol instead of the current controlled current source's diamond shaped symbol, is there any problem?

 

The substitution of a battery in place of the current-controlled current-source upsets the integrity of the transistor model.

hgmjr

 

Do upsetting the "integrity" of model means you are going to the wrog path? Obviously going to wrong path means you are going to find fish instead of voltage.

 

Yes, you would be headed down the wrong path if you substitute a battery in place of the current-controlled current-source.

You will not find fish but you will get the wrong answer.

hgmjr

 

In the link you have given me it is said that:-
"We will assign a positive sign to a term that refers to
a reference voltage drop, and a negative sign to a term that refers
to a reference voltage rise."
But the method which i learned says that we assign positive signs where there are voltage rises and vice versa. What about it?

 

I would refer you to the link on the subject of simple series circuits contained in the AAC ebook as a good source of information on the topic of proper sign convention for current and voltage.

hgmjr

 

Thanks i am gonna chenk it and then disturbing everyone very soon.

 

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I have inserted an image which shows wheatstone bridge solved through KVL with my method. Please can anybody tell whether is it right or wrong. If it is wrong, then why?