003A motor has coils with a resistance of 15 2and operates from a voltage of 240 V. Whenthe motor is operating at its maximumn speed,the back emf is 116 V.Find the current in the coils when the motoris first turned on.Answer in units of A.Find the current in the coils when the motorhas reached maximum speed.Answer in units of A.If the current in the motor is 13A at someinstant, what is the back emf at that time?Answer in units of V.

Given Data: The given resistance is: R=15 Ω The voltage of the circuit is: ε=240 V The back emf at…

A motor has coils with a resistance of 15 N and operates from a voltage of 240 V. When the motor is operating at its maximumn speed, the back emf is 116 V. Find the current in the coils when the motor is first turned on. Answer in units of A.

A motor has coils with a resistance of 15 N and operates from a voltage of 240 V. When the motor is operating at its maximumn speed, the back emf is 116 V. Find the current in the coils when the motor is first turned on. Answer in units of A.

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter13: Electromagnetic Induction

Section: Chapter Questions

Problem 62P: A small series-wound dc motor is operated from a 12-V car battery. Under a normal load, the motor...

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Concept explainers

Voltage Across Inductor

An actor is a passive electrical component that consists of a coil bent in the form of wire which uses electromagnetism to produce electric current through the coil. When the electric current flows through a conductor that is the coil, a magnetic flux is developed around the conductor. This flow of current through the coil creates a magnetic field based on Fleming's Right-hand thumb rule. If there is any decrease in the current passing through the inductor, then the magnetic field will also decrease and energy is released through the generation of electric current. There is also a secondary voltage inducing in the same coil due to the magnetic flux, since it opposes any changes in the electric current flowing through the circuit. An inductor is also called choke, coil, or solenoid. A choke is designed to block certain frequencies when the DC current passes. A winding coil is coated with insulation to give extra insulation and protect the circuit. They are usually tightly wrapped around a central core which is cylindrical in nature so that the magnetic flux can be induced. The solenoid is a three-dimension coil that is used to exhibit electromagnetism when the magnetic field is developed due to the current flowing through the coil. The sign convention of the inductor is the same as the power dissipating device. When the current flows into the positive side of the voltage across the inductor, the value is positive and the inductor dissipates power whereas when the inductor releases the power back to the circuit, the current has a negative sign convention. 

Question

003
A motor has coils with a resistance of 15 2
and operates from a voltage of 240 V. When
the motor is operating at its maximumn speed,
the back emf is 116 V.
Find the current in the coils when the motor
is first turned on.
Answer in units of A.
Find the current in the coils when the motor
has reached maximum speed.
Answer in units of A.
If the current in the motor is 13A at some
instant, what is the back emf at that time?
Answer in units of V.

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