1. The problem statement, all variables and given/known data I need to know what effect wire heating would have on the reading of the EMF of a battery, and how the heating effect can be reduced! 2. Relevant equations V= IR 3. The attempt at a solution Well I know that the heating effect increases the resistance in the wire but this is as far as I've got...as far as minimising the effect would a thicker wire work? As according to the resistivity equation a greater area results in less resistance...?