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Hi,

Which is correct and why:

Who am I?

or

Who I am?

Thanks,

ATM
Comments  
"Who am I?" is correct if you are asking a direct question.

In indirect speech you might say something like "I wonder who I am."

Miriam
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~comes back to edit~

I forgot you asked "why".
The verb "to be" doesn't use any auxiliaries in the present simple, so in order to make a question you only need to invert the position of the subject and the verb.
In an affirmative sentence, you say:
"I am atm."

In a question, you turn "I am" into "am I", so you have:
"Who am I?" (for a wh-question)
or
"Am I atm?" (for a yes-no question)

Affirmative:
I am
You are
He/she/it is
We/you/they are

Interrogative:
Am I?
Are you?
Is he/she/it?
Are we/you/they?

Hope it helps.
Thank you, Mariam.

When a company uses a question like "who are we" to introduce itself (e.g., in a corporate profile), will it be considered a direct or indirect question? In this case, although the company is asking the question, but the answer is aimed at someone else.

ATM
Students: We have free audio pronunciation exercises.
You're welcome, atm. Emotion: smile

I've seen those "who we are" pages in many websites. The company is not really asking the reader a question; rather, they are saying "We're going to tell you who we are" or "We're going to tell you something about us" ("Who are we?" would be a direct question).
They are similar to pages such as "where we are", "what we do/offer".
The form, as you said, is that of an indirect question, but you're not really being asked anything.

Miriam
What is the negative interrogation of "I am"? Need your help.
am I not?
Students: Are you brave enough to let our tutors analyse your pronunciation?
Thank you! So, it's a little different from " aren't you?" " isn't he?" etc.