An Inspector's Call by Priestley

How does Priestley create drama and   tension in ‘An Inspector Calls’?
 
In 1945 J.B. Priestley wrote the play ‘An Inspector Calls’. It was set in 1912.He created a lot of tension since his arrival? but what I’m here to investigate is,   how did Priestley make the tension created   effective? In this essay I hope to explore and evaluate the play to find the answers to these questions. In particular ‘How does Priestley create tension in the end of act 2 ‘An Inspector Calls’?
 The end of Act 2 is full with drama and tension as all the clues that have been dropped finally come to sense to the audience. Although it is not mentioned, Priestley makes it clear that the inspector knew that Eric Birling was the father of Eva Smith's child and had wanted for Ms Birling to declare what punishment she believed should be given to the young man "Make sure that he's compelled to confess in public his responsibility." The stage direction (with sudden alarm) adds to the tension that Priestley has successfully built thus far.
I am looking at pages 44-49 as my focus pages. In this part of the play, the Inspector moves onto questioning Mrs Birling and the scene ends when Eric enters. The key themes are continued throughout these pages; especially the theme of responsibility. It is shown through Mrs Birling and how she tries to be resistant to it. She is blind to her involvement when she states ‘I accept no blame for it at all’, clearly indicating that she cannot accept her part in Eva Smith’s death. Responsibility changes in Act Two. Mrs Birling tries to shift the blame onto someone else, so she says “I blame the young man- the father of the child”, “he’d be entirely responsible”. Inspector Goole wants to emphasise what she has just said so he keeps asking what should be done to the young man. She replies that he should be “compelled to confess in public his responsibility”. By saying this, Mrs Birling not only shifts the blame off her own shoulders, but puts it onto her son’s. She...