Small buzzing (SSD activity) when the air is plugged

HI! im have a 2011 MBA 13.
I Want to know if It is normal to hear a little hum or buzz (t sounds like a spinning hard disk, o a shaver) every time I scroll a page on Safari and also when open a APP or loading something (like a SDD have activity) .I understand that SSD would not have to do it because it has no moving parts
When I unplug the Magsafe of the air disappears completely only appear when the air is plugged .
The small hum/buzz comes close to the ESC key near magsafe connector
Thanks in advance

With the battery fully charged and with the mag-safe plugged NO hum/buzz issues only be hear when charging and the SSD have activity why? this is normal?.

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Serial Number:          9G02903MAD3NB
Manufacturer:          DP
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Firmware Version:          201
Hardware Revision:          2
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Small buzzing (SSD activity) when the air is plugged

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