1. The problem statement, all variables and given/known data A well-insulated electric water heater warms 137 kg of water from 20°C to 45.0°C in 16.0 min. Find the resistance of its heating element, which is connected across 220-V potential difference. 2. Relevant equations R=V/I 3. The attempt at a solution Not sure how to approach this one. Should I refer to a calorimetry approach along with electrical relations? How might I start this one? Any help/hints would be greatly appreciated.