1) An electrical load is rated for 1200 W at 120-V, single phase. The load current is 14 A. What is thepower factor?PF=2) A DC circuit with a 24 V source has three resistors wired in parallel, with resistances of 70, 100, and25 Q. What is the total current flowing in this circuit?Current =3) A three-phase motor is connected to a 277/480-V electrical system and draws 20 A with a PF of 0.85.How much annual energy does this device use if it is operated for 200 hours during the year?Energy =

Answered: 1) An electrical load is rated for 1200…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Question

1) An electrical load is rated for 1200 W at 120-V, single phase. The load current is 14 A. What is the
power factor?
PF=
2) A DC circuit with a 24 V source has three resistors wired in parallel, with resistances of 70, 100, and
25 Q. What is the total current flowing in this circuit?
Current =
3) A three-phase motor is connected to a 277/480-V electrical system and draws 20 A with a PF of 0.85.
How much annual energy does this device use if it is operated for 200 hours during the year?
Energy =

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Given,

Power, $P = 1200 W$

voltage, $V = 120 V$

current, $I = 14 A$

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