Why does iPod take a long time to backup?

Why do batteries in iPod, cellphones, etc. take time to charge?

• When its plugged into the wall, why don't they just take all the energy they need right away, why does it take time to recharge it all the way?

• Answer:

  Yep it will set fire because the energy witch comes from the wall is too large so the ipod or whatever it is needs time to convert it to a small capacity.............. The ipod or the cellphone also needs time to get that small amount of energy into a stored energy.... I hope this is helpful.... (best answ)