1. The problem statement, all variables and given/known data 2. Relevant equations P=V2/R P=I2R V=IR 3. The attempt at a solution As the resistance of R increases, the potential difference across R increases, so the power dissipated in R increases too. But I can't seem to see how the power decreases afterwards. Is it because, as time passes, the e.m.f of the battery dies out eventually?