Answered: The voltage and current waveforms, for…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Question

The voltage and current waveforms, for the circuit of Fig. 2.4, are shown on the graph of Fig. 2.5.
The instantaneous power curve has also been plotted on the graph. Note that the instantaneous power curve p is sinusoidal and goes through two complete cycles during one cycle (360°) of the voltage or current.
a) Does the power curve ever go negative when the circuit load is resistive?

b) Is this power “real”?

c) Can you visually determine if the average power for one cycle (360°) is actually 1⁄2 of the peak power ?
d) What is the average power in Watts ?

+80
+4
+60
e
+3
+40
+2
+20
+1
30
60
90°
120
150
210
1240
270
300
330
time
-20
-1
-40
-2
-3
-60
-80
-4
Fig. 2.5

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