Room for work 6. {30 Points} The dc in the circuit shown can be modeled with a 5.6[H] inductor in series with a 47[] resistor. The voltage across the motor is monitored using a 1000[V] full-scale voltmeter that has a meter resistance of 5[M]. The motor had been running for a long time, and then was shut down by opening the switch at = 0. t a) Find the voltage across the voltmeter right after the switch was opened, assuming that the models here all remain valid. b) Assume that an additional resistor is placed in parallel with the voltmeter. RX Find the value for needed to make sure that the magnitude of the voltage RX across the voltmeter does not exceed 1000[V] in this circuit. c) For the case in part b), assuming the value you found for find the energy RX, dissipated in for > 0. RX t
Room for work 6. {30 Points} The dc in the circuit shown can be modeled with a 5.6[H] inductor in series with a 47[] resistor. The voltage across the motor is monitored using a 1000[V] full-scale voltmeter that has a meter resistance of 5[M]. The motor had been running for a long time, and then was shut down by opening the switch at t = 0. a) Find the voltage across the voltmeter right after the switch was opened, assuming that the models here all remain valid. b) Assume that an additional resistor RX is placed in parallel with the voltmeter. Find the value for RX needed to make sure that the magnitude of the voltage across the voltmeter does not exceed 1000[V] in this circuit. c) For the case in part b), assuming the value you found for RX, find the energy dissipated in RX for t > 0.
ECE2300_Final_Exam_Spring2015.docx