No it is not a homework problem I made it myself in order to clearly explain what I am trying to ask.The question could be invalid and silly therefore .If there is a 9V battery What is the potential of it's positive and negative terminals respectively? If positive terminal's potential is 3V and potential of negative terminal -6V then there would be potential difference of 9V. Similarly if positive terminal's potential is 2V and potential of negative terminal -7v then there would be potential difference of 9V. So many answers are possible therefore potential of one terminal should be given. Am I making sense?Or all of these are wrong?