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An engineer connects a resistor in parallel with an electric motor (a schematic of the circuit is given in the figure). Armature 7.50 2 450 mH 12.0 V - 10.0 V The purpose of the resistor in the circuit is to limit the voltage across the armature coils, if, for example, the motor is disconnected from its power supply while running. For the configuration shown, a 12.0 V DC motor has an armature with a resistance of 7.50 N and an inductance of 450 mH, and assume the back emf in the armature coils is 10.0 V when the motor is running at normal speed. Calculate the maximum resistance R (in N) that limits the voltage across the armature to 79.0 V when the motor is unplugged.

An engineer connects a resistor in parallel with an electric motor (a schematic of the circuit is given in the figure). Armature 7.50 2 450 mH 12.0 V - 10.0 V The purpose of the resistor in the circuit is to limit the voltage across the armature coils, if, for example, the motor is disconnected from its power supply while running. For the configuration shown, a 12.0 V DC motor has an armature with a resistance of 7.50 N and an inductance of 450 mH, and assume the back emf in the armature coils is 10.0 V when the motor is running at normal speed. Calculate the maximum resistance R (in N) that limits the voltage across the armature to 79.0 V when the motor is unplugged.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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6# please provide 4 decimal places in the answer

An engineer connects a resistor in parallel with an electric motor (a schematic of the circuit is given in the figure). Armature 7.50 2 450 mH 12.0 V - 10.0 V The purpose of the resistor in the circuit is to limit the voltage across the armature coils, if, for example, the motor is disconnected from its power supply while running. For the configuration shown, a 12.0 V DC motor has an armature with a resistance of 7.50 N and an inductance of 450 mH, and assume the back emf in the armature coils is 10.0 V when the motor is running at normal speed. Calculate the maximum resistance R (in Q) that limits the voltage across the armature to 79.0 v when the motor is unplugged.
Transcribed Image Text:An engineer connects a resistor in parallel with an electric motor (a schematic of the circuit is given in the figure). Armature 7.50 2 450 mH 12.0 V - 10.0 V The purpose of the resistor in the circuit is to limit the voltage across the armature coils, if, for example, the motor is disconnected from its power supply while running. For the configuration shown, a 12.0 V DC motor has an armature with a resistance of 7.50 N and an inductance of 450 mH, and assume the back emf in the armature coils is 10.0 V when the motor is running at normal speed. Calculate the maximum resistance R (in Q) that limits the voltage across the armature to 79.0 v when the motor is unplugged.
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