Question

A shunt motor is connected to a $110-V$ line. When the armature generates a back emf of $104 \mathrm{~V}$, the armature current is $15 \mathrm{~A}$. Compute the armature resistance.

Name: Problem 20, Chapter 33: Schaum’s Outline of College Physics
Uploaded: 2021-09-14T17:05:19-08:00
Duration: 1 min 55 s
Channel: Vishal Gupta
Description: A shunt motor is connected to a 110-V line. When the armature generates a back emf of 104 V, the armature current is 15 A. Compute the armature resistance.

   A shunt motor is connected to a $110-V$ line. When the armature generates a back emf of $104 \mathrm{~V}$, the armature current is $15 \mathrm{~A}$. Compute the armature resistance.

Schaum’s Outline of College Physics

Eugene Hecht 11th Edition

Chapter 33, Problem 20

Instant Answer

Solved by Expert Vishal Gupta

09/14/2021

Step 1

We know that the back emf (electromotive force) is generated when the motor is running, and it opposes the applied voltage. So, we can write the equation for the voltage across the armature as: Applied Voltage (V) = Back emf (E) + Voltage drop across armature Show more…

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A shunt motor is connected to a $110-V$ line. When the armature generates a back emf of $104 \mathrm{~V}$, the armature current is $15 \mathrm{~A}$. Compute the armature resistance.

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Key Concepts

Shunt Motor

A shunt motor is a type of DC motor in which the field windings are connected in parallel (shunt) with the armature. This configuration provides relatively constant magnetic flux and results in a motor that has good speed regulation under varying load conditions.

Back Electromotive Force (Back EMF)

Back EMF is the voltage generated by the rotating armature of a DC motor that acts in opposition to the applied supply voltage. It is proportional to the speed of the motor and the magnetic flux, and it plays a crucial role in determining the net voltage across the motor's armature, which influences its performance.

Ohm's Law

Ohm's Law is a fundamental principle in electrical circuits that states the voltage drop across a resistor is equal to the product of the current flowing through it and its resistance. This law is essential for calculating unknown values in a circuit, such as determining the armature resistance from the voltage difference and current.

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