1. The problem statement, all variables and given/known data A current of 22 amperes flows in a heater coil whose resistance is 5 ohms. What E M F in volts is required? 2. Relevant equations 3. The attempt at a solution Not quite sure where to begin. I'm thinking the internal resistance, R, is inherent w/the circuit so EMF must be greater than the velocity calculated. Velocity =IXR=22x5=110 EMF=V +IR = 110 + 22x5=220 volts Any comments here on if this is correct?