Electrical Engineering: Principles & Applications (7th Edition)
Electrical Engineering: Principles & Applications (7th Edition)
7th Edition
ISBN: 9780134484143
Author: Allan R. Hambley
Publisher: PEARSON
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Chapter 5, Problem 5.27P

We have v 1 ( t ) = 10 cos ( ω t + 30 ° ) . The current i 1 ( t ) has an rms value of 5 A and leads v 1 ( t ) by 20 ° . (The current and the voltage have the same frequency.) Draw a phasor diagram showing the phasors. Write an expression for i 1 ( t ) of the form I m cos ( ω t + θ ) .

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The following is given for a series R-L-C circuit: resistor (R) = 8 Ohms, an inductor (L) = 32 mH and a capacitor (C) = 800uF. The circuit is supplied by a voltage source of e = 120 sin (125t) Volts. What is the rms value of the circuit current?
Transform the sinusoids corresponding to phasors : (i) V = 50Z- 50° V (ii) V = – 204110 V (iii) I = j(10+ j 5) A
Consider the sinusoidal voltagev(t)=150cos(120πt−60∘)V What is the maximum amplitude of the voltage? What is the frequency in hertz?   What is the frequency in radians per second?   What is the phase angle in radians?   What is the phase angle in degrees?   What is the period in milliseconds?   What is the first time after t=0 that v= 150 V?   The sinusoidal function is shifted 125/18ms125/18ms to the right along the time axis. What is the expression for v(t)?   What is the minimum number of milliseconds that the function must be shifted to the left if the expression for v(t) is 150sin(120πt)V?
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