Question

A 120 V, 60 Hz, 0.25 Hp universal motor runs at 2000 rpm and takes 0.4 A when connected to a 120 V DC source. Determine the speed, torque, and power factor of the motor when it is connected to a 120 V, 60 Hz supply and is loaded to take 0.6 A (rms) of current. The resistance and inductance measured at the terminals of the machine are 20 ohms and 0.25 H respectively.

Name: a 120 v 60 hz 025 hp universal motor runs at 2000 rpm and takes04 a when connected to a 120 v dc source determine the speedtorque and power factor of the motor when it is connected to a 120 16807
Uploaded: 2024-11-04T15:57:51-08:00
Duration: 1 min 29 s
Channel: Lien Le
Description: a 120 v 60 hz 025 hp universal motor runs at 2000 rpm and takes04 a when connected to a 120 v dc source determine the speedtorque and power factor of the motor when it is connected to a 120 16807

          A 120 V, 60 Hz, 0.25 Hp universal motor runs at 2000 rpm and takes 0.4 A when connected to a 120 V DC source. Determine the speed, torque, and power factor of the motor when it is connected to a 120 V, 60 Hz supply and is loaded to take 0.6 A (rms) of current. The resistance and inductance measured at the terminals of the machine are 20 ohms and 0.25 H respectively.

Added by James R.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Lien Le

11/04/2024

Step 1

** Given: - Voltage (V) = 120 V - Current (I) = 0.4 A - Resistance (R) = 20 ohms Using Ohm's Law, the back EMF (E_b) can be calculated as: \[ E_b = V - I \cdot R \] \[ E_b = 120 - 0.4 \cdot 20 \] \[ E_b = 120 - 8 \] \[ E_b = 112 \text{ V} \] Show more…

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A 120 V, 60 Hz, 0.25 Hp universal motor runs at 2000 rpm and takes 0.4 A when connected to a 120 V DC source. Determine the speed, torque, and power factor of the motor when it is connected to a 120 V, 60 Hz supply and is loaded to take 0.6 A (rms) of current. The resistance and inductance measured at the terminals of the machine are 20 ohms and 0.25 H respectively.