A billionaire rises to the occasion

So I'm playing Arkham Asylum and, like, the very beginning of the game you open some doors and shut down electrically powered things by just blowing up the connected panel with a batarang, but then later on you need another tool that blows them up via some kind of frequency overload. If I am still just blowing up the box, why can't I hit it with something or even use my actual explosives? Taking the "bat logic" to game mechanics too. lol