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8-What is the efficiency of a motor with a resistance of 6 ohms and a zit emf of 12 V when operating with a current of 2 A?  A) 50  B) 75  C) 25  D) 100  E) 10

8-What is the efficiency of a motor with a resistance of 6 ohms and a zit emf of 12 V when operating with a current of 2 A?  A) 50  B) 75  C) 25  D) 100  E) 10

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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8-What is the efficiency of a motor with a resistance of 6 ohms and a zit emf of 12 V when operating with a current of 2 A?

 A)

50
 B)

75
 C)

25
 D)

100
 E)

10
Expert Solution
Step 1

efficiency = output power input power×100

For a motor output power = current * zit emf

and input power = output power + copper losses

                           = current * zit emf + (current)2 * resistance . 

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