A series LR circuit contains an emf source of 14 V having no internal resistance, a resistor, a 34 H inductor having no appreciable resistance, and a switch. If the potential difference across the inductor is 80% of its maximum value 4s after the switch is closed, what is the resistance of the resistor? A series LR circuit contains an emf source of 14 V having no internal resistance, a resistor, a 34 H inductor having no appreciable resistance, and a switch. If the potential difference across the inductor is 80% of its maximum value 4s after the switch is closed, what is the resistance of the resistor?