Electronics > Beginners

LED strip lighting even without a positive terminal connection

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Adhith:
hello everyone..
I have been making a project with some 12V RGB LED strips. while trying to check the LED strips I found something interesting. I just connected the ground terminal from a 12V wall adapter to the terminal "B" and left the positive terminal disconnected to the strips but, while touching the positive terminal on the strips  with my finger I saw that the led strips are lighting up with a very low brightness. This also happens even when i tough anywhere in the strip with my finger. I wonder how this is happening. anyone could explain to me about it. I'm attaching a pic of the test that I have done.

oPossum:
Y capacitor leakage current

Psi:
yep, pretty normal, you are acting as an antenna and coupling in some 50/60hz AC mains.  Doesnt take much to light up an led

Zero999:
Hopefully the LEDs have some kind of static protection built-in, otherwise reverse over-voltage can damage them. Red LEDs are normally fine, but the modern blue/white variety tend to be damaged by current flowing in the reverse direction.

Adhith:
Thank you everyone for your replies. To be honest i didn't completely understood the scene. Since i'm a beginner in electronics im pretty much still confused and if you guys don't mind could you explain a bit ?? like how is it still lighting and the path of current flow and all.

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