This may be a basic question, but I am not sure about the exact reason, so I'm asking this
I've noticed quite a few times that when you plug an iPad charger to a socket and then switch it on, then take the charger out and connect the USB cable to iPad, it still detects current for a moment. Why does this happen so? Is there some residual charge left on the cable? Why are chargers made so,then? How does current flow when there is no complete path?
Why does it not happen with all the devices that we use?