How does it draw the exact current it needs? Is it as simple as that because my headphones just have resistance of 5 ohm?
And also, my 5V2A charger can charge any 5V devices that draw current equal to or below 2A right?
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Yes, and yes. The current drawn is determined by the resistance of the device drawing it, regardless of how much current the power supply could produce without a drop in voltage.
Edit – to be clear this applies to dumb chargers/power supplies, not things with circuits that are able to switch over to trickle charging, shut off or adopt some other strategy depending on the device it is supplying.
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