Electricity for the Trades
3rd Edition
ISBN: 9781260437386
Author: Petruzella, Frank
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 5.1, Problem 4RQ
Explain how circuit breakers and fuses protect a circuit.
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The joint density function of two continuous random variables X and
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p(x, y) = {cxy
0 < x < 4,1 < y < 5
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Below is a rough schematic of the lighting system for a streetcar powered by a 120 VDC supply. How can I arrange the wires inside the trolley for the interior lights (1-16), headlights (19-20), doors (21-24), and platform lights (17-18), ensuring that each has its own switch?
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12.8 Obtain the inverse Laplace transform of each of the fol-
lowing functions by first applying the partial-fraction-expansion
method.
(a) Fi(s)
6
=
(s+2)(s+4)
(b) F2(s)
=
(c) F3(s) =
4
(s+1)(s+2)2
3s3 +36s2+131s+144
s(s+4)(s²+6s+9)
2s²+4s-10
(d) F4(s)
=
(s+6)(s+2)²
Chapter 5 Solutions
Electricity for the Trades
Ch. 5.1 - Prob. 1RQCh. 5.1 - Polarity markings are shown on symbols...Ch. 5.1 - Compare the type of voltage produced by a solar...Ch. 5.1 - Explain how circuit breakers and fuses protect a...Ch. 5.1 - What are the two basic functions of a switch?Ch. 5.1 - Compare the operation of a normally open and...Ch. 5.1 - What type of circuit component is a light bulb...Ch. 5.1 - In general, what is the function of resistors...Ch. 5.1 - Two wires are shown on an electrical diagram...Ch. 5.1 - Give one advantage and one limitation of the...
Ch. 5.1 - Explain why schematic diagrams are easier to read.Ch. 5.1 - What is a wiring diagram intended to show?Ch. 5.1 - Prob. 13RQCh. 5.1 - The one-line diagram is often used with a power...Ch. 5.2 - What best describes a simple circuit?Ch. 5.2 - A lamp is to turn ON when either one or the other...Ch. 5.2 - What connection of two or more switches can be...Ch. 5.2 - Three 120-V, 40-W incandescent lamps are connected...Ch. 5.2 - Two 12-V, 10-W lamps are connected in parallel to...Ch. 5.2 - A control system calls for a light to come on when...Ch. 5.2 - One bulb in a 20-string series-connected holiday...Ch. 5.2 - Prob. 8RQCh. 5.2 - Prob. 9RQCh. 5.2 - Prob. 10RQ
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- 12.4 Determine the Laplace transform of each of the followingfunctions by applying the properties given in the Tables (a) f1(t) = 4te−2t u(t)(b) f2(t) = 10cos(12t +60◦) u(t)*(c) f3(t) = 12e−3(t−4) u(t −4)(d) f4(t) = 30(e−3t +e3t ) u(t)(e) f5(t) = 16e−2t cos4t u(t)(f) f6(t) = 20te−2t sin4t u(t)arrow_forward8. Obtain the inverse Laplace transform of each of the followingfunctions by first applying the partial-fraction-expansionmethod.(a) F1(s) =6(s+2)(s+4)(b) F2(s) =4(s+1)(s+2)2(c) F3(s) =3s3 +36s2 +131s+144s(s+4)(s2 +6s+9)(d) F4(s) =2s2 +4s−10(s+6)(s+2)2arrow_forward12.12 In the circuit of Fig. P12.12(a), is(t) is given by the waveform shown in Fig. P12.12(b). Determine iL (t) for t≥ 0, given that R₁ = R₂ = 2 2 and L = 4 H. is() R₁ R2: (a) Circuit is(t) 8A- 8e-21 elle (b) is(t) Figure P12.12 Circuit and waveform for Problem 12.12. iLarrow_forward
- 12.12 In the circuit of Fig. P12.12(a), is(t) is given by thewaveform shown in Fig. P12.12(b). Determine iL(t) for t ≥ 0,given that R1 = R2 = 2 W and L = 4 H.arrow_forward12.4 Determine the Laplace transform of each of the following functions by applying the properties given in Tables 12-1 and 12-2 on pages 642-643. (a) fi(t)=4tet u(t) (b) f2(t)=10cos (12t+60°) u(t) *(c) f3(t) = 12e−3(t−4) u(t −4) (d) f4(t) = 30(e³ +e³t) u(t) (e) fs(t)=16e2t cos 4t u(t) (f) f6(t)=20te 2 sin 4t u(t)arrow_forwarda) Calculate the values of v and i. + 803 1A Va 82 b) Determine the power dissipated in each resistor. 1A Va (a) + I 50 V 0.2 S (b) + D + 1 Α υ€ 20 Ω 50 V 250 ΩΣ ia (c) (d) Copyright ©2015 Pearson Education, All Rights Reservedarrow_forward
- Exercise 3-12: Find the Thévenin equivalent of the circuit to the left of terminals (a, b) in Fig. E3.12, and then determine the current I. 502 502 0.6 Ω 20 V | + <302 Ω ΣΙΩ b 2025 Ω 15A Figure E3.12arrow_forward2. Consider following feedback system. r(t) e(t) y(t) K G(s) 1 where G(S) = s²+as+b In above, K, a and b are constants. Select the values of K, a and b in a way so that (i) (ii) (iii) the closed loop system is stable, steady-state error of the closed-loop system for step input is 0.2, the closed-loop response has 20% overshoot and 2 seconds as settling time.arrow_forward4. Answer the following questions. Take help from ChatGPT to answer these questions (if you need). But write the answers briefly using your own words with no more than two sentences, and make sure you check whether ChatGPT is giving you the appropriate answers in the context of class. a) What is the advantage of the PI controller over the proportional controller? b) What is the advantage of the PD controller over a proportional controller? c) In the presence of noise, what problem do we face implementing the derivate part of the PID (or PD) controller? To address this, what do we usually use? d) What are the forms of lead compensator and lag compensator? How do these two types of compensators differ?arrow_forward
- 3. Consider the following closed-loop system as shown in the figure. 16 Ge(s) s(s + 4) Suppose Ge(s) is a PID controller with Kp = 1, KD = 2 and K₁ = 3. a) Find the controller transfer function G₁(s). b) Find the open-loop transfer function. c) Find the closed-loop transfer function.arrow_forwardExercise 3-12: Find the Thévenin equivalent of the circuit to the left of terminals (a, b) in Fig. E3.12, and then determine the current I. 502 5 Ω 0.6 Ω a 3Ω ΣΙΩ b 20 V 1 + 2027 15A Figure E3.12arrow_forwardsolve and show workarrow_forward
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