My son plugged in your

Question

My son plugged in your AC adaptor Model AD 126 when we got Verizon DSL and he put the modem in my room. Cords from that modem go to my computer and to 2 other computers elsewhere in the house. The adaptor is plugged into a power bar plugged into a wall outlet. That same outlet has another power bar which has plugs for tv, Dish Satellite box, a lamp and a base for a portable phone. I just noticed that the adaptor feels hot to the touch. Is this normal or do we have too many things using the same double outlet on that wall?