Weird Sound when charging

[Kidder1994]

Hello guys, well my problem is that when my iphone is charging in a extension cable from a wall charger, while charging it does a little noise very imperceptible at first... but when you listen carefully you can hear it, its like a very low rattle noise, that when i unplug the iphone it dissapears, it is an original apple charger with original lighting connector and a iphone 5 16 gb... it is normal? :C

it doenst happen always, but im worried if its something i need to take serious.

Thx in advance

 

[tardman91]

Where do you rest it while its charging? It could be from some kind of electrical interference or something.

 

[Kidder1994]

well i put the phone over his box, near the phone i have a remote control of my tv, another phone inside another box, and thats all... all other items are non-electrical

 

[Mrbobb]

Is normal.

 

[charlituna]

Does it make that noise if you plug the wall charger directly into the wall

 

[Kidder1994]

didnt test that yet, i will check and post it here afterwards