"let us know" vs "let me know"

[AmitHorizon]

where are use of let us and let me.Please tell me about meaning of " let us ".

many time i want to use of this word but i do no use due to lack of knowledge.

[Peterkua]

"Let us" = "Let's"
Let's get together more often
Let's go to the beach tomorrow

Let me go or I'll scream
Will you let me sit for the test again?

[Brently]

The only difference between "let me know" and "let us know" is whether you're requesting that you alone (me) or you as part of a group (us) be informed.

In business English writing, "us" is often used to mean "the company" when the writer needn't be the sole contact person.

[OxfordBlues]

yes these are two different uses of let.

Peterkua brings up a modal usage of let us called the cohortative. it's used to mutually encourage two or more people to do something (when one of the people is always the speaker).

As Brently points out, the only difference in the OP's examples is who is requested be informed. In this usage let has the original meaning of allow. Thus 'let us know' is literally "please all us to know (what you know)."
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[AmitHorizon]