A 12V electric motor is turned on. When the motor is first started, the current is 1.0A. Once running, the current on the motor is 0.24A. a. What is the resistance of the motor? b. What is the running voltage for the motor? c. What is the back-EMF?
A 12V electric motor is turned on. When the motor is first started, the current is 1.0A. Once running, the current on the motor is 0.24A. a. What is the resistance of the motor? b. What is the running voltage for the motor? c. What is the back-EMF?
Physics for Scientists and Engineers, Technology Update (No access codes included)
9th Edition
ISBN:9781305116399
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter31: Faraday’s Law
Section: Chapter Questions
Problem 31.48P: A motor in normal operation carries a direct current of 0.850 A when connected to a 120-V power...
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1. A 12V electric motor is turned on. When the motor is first started, the current is 1.0A. Once running, the current on the motor is 0.24A.
a. What is the resistance of the motor?
b. What is the running voltage for the motor?
c. What is the back-EMF?
2. The length of the moving conductor L=0.25m (you may assume that this is the distance from “rail to rail”). The strength of the magnetic field is 0.25T. If you need 1.5V of induced emf to light the bulb, and the maximum distance the bar can move is 1m, how much time must the bar be moved?
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