1. The problem statement, all variables and given/known data When a 9.0V - battery is temporarily short-circuited, a 400mA- current flows. What is the internal resistance of the battery? Ans :R_int = 9/(400*10^-3) Can someone explain why this is the answer, I understand its just V/I, but what exactly does this mean? I am new to circuits so I am not sure what the term shot-circuit exactly mean. I am also not sure what a internal resistance of the battery mean, just plain resistance?