A motor operated on a 120V/60-Hz line uses 850 watt of power and has a 0.87 power factor.The resistance of the motor is
A)12.83 ohms.
B)14.74 ohms.
C)18.95 ohms.
D)23.91 ohms.

Question

Quizplus · Accepted Answer

The formula for calculating resistance is:

R = (V^2)/(P * PF)

Where:
V = 120V
P = 850W
PF = 0.87

Plug in the values and solve for R:

R = (120^2)/(850 * 0.87)
R = 14.74 ohms

Therefore, the resistance of the motor is approximately 14.74 ohms, and the correct answer is B.

A Motor Operated on a 120V/60-Hz Line Uses 850 Watt