Is it normal for iphone charger to get hot while charging your iphone?

I just bought a iphone charger off ebay and made sure its genuine and when i hooked it up it was warm then started getting hot is that normal? Its my first iphone and i know very little about them. Is it normal for iphone charger to get hot while charging your iphone - 1

Happens to me too.

May depend on what you are doing on it at the time, but most times it doesn't get hot.