Need help with applying EMA!

Suppose I am viewing 15 minute candlestick chart
and I have applied two EMA as

  1. EMA with period value 15
  2. EMA with period value 30
    Can you please tell me what is exactly happening here?
    Does it mean I am comparing EMA (15min into 15) vs EMA (15min into 30)? i.e., 225 min EMA vs 450 min EMA?
    How do I apply 15 x 30 minutes EMA?

Please tag the question under the relevant category.

Short answer to it is available in an elaborate manner on Varsity in 13.4 – Moving average crossover system under Module 2 Chapter 13.
Here is the link to it, please help yourself:

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