ELECTRICITY FOR TRADES
3rd Edition
ISBN: 9780078118630
Author: Petruzella
Publisher: RENT MCG
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Chapter 4.2, Problem 3RQ
A toaster draws 8 amperes when connected to a 120-volt source. What is the wattage rating of the toaster?
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2.56. The impulse response of a discrete-time LTI system is given by
h[n] = ()u[n]
Let y[n] be the output of the system with the input
Find y[1] and y[4].
Ans. y[1] = 1 and y[4] = 1.
x[n] = 28[n]+8[n-3]
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8. Please note you may be asked to explain your solution to any of the questions.
Question 1 (25 marks)
Use constant-voltage-drop model to analyse the circuit in Figure 1.
(a) Re-draw the circuit by replacing each diode with its equivalent circuit.
(b) Calculate the values of li, 12, b and Is.
(c) Determine the voltage across R1, VR-
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Chapter 4 Solutions
ELECTRICITY FOR TRADES
Ch. 4.1 - What is the practical unit of electric charge?Ch. 4.1 - Prob. 2RQCh. 4.1 - Prob. 3RQCh. 4.1 - Explain what a current flow of 1 ampere can be...Ch. 4.1 - Account for the fact that electric current travels...Ch. 4.1 - Prob. 6RQCh. 4.1 - Prob. 7RQCh. 4.1 - Prob. 8RQCh. 4.1 - Prob. 9RQCh. 4.1 - Prob. 10RQ
Ch. 4.1 - Prob. 11RQCh. 4.1 - Prob. 12RQCh. 4.1 - What is the cause and effect of resistance?Ch. 4.1 - When using an ohmmeter to measure resistance, what...Ch. 4.1 - Convert the following data: a. 12,000 A to kA b....Ch. 4.1 - Prob. 16RQCh. 4.2 - Define electric power.Ch. 4.2 - What is the basic unit used to measure electric...Ch. 4.2 - A toaster draws 8 amperes when connected to a...Ch. 4.2 - Prob. 4RQCh. 4.2 - Prob. 5RQCh. 4.2 - Prob. 6RQCh. 4.2 - Prob. 7RQCh. 4.2 - Compare a closed and an open electric circuit.Ch. 4.2 - Prob. 9RQCh. 4.2 - What does Ohms law tell us about current flow in a...Ch. 4.2 - Ohms law is applied to a circuit using what three...Ch. 4.2 - Prob. 12RQCh. 4.2 - Prob. 13RQCh. 4.2 - Prob. 14RQCh. 4.2 - Prob. 15RQCh. 4.2 - Prob. 16RQCh. 4.2 - Prob. 17RQCh. 4.2 - Prob. 18RQ
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- 146 Romania with step costs in km Straight-line distance to Bucharest * Oradea 71, 75, Zerind 151 rad & 140 197 Neamt 87 lasi 92 Arad 366 Bucharest 0 Craiova 160 Dobreta 242 Eforie 161 Fagaras 178 118 Sibiu 99 Fagaras 80 Rimnicu Vilcea Giurgiu 77 Vaslui Hirsova 151 Tasi 226 Lugoj 244 Timisoara 111 Mebadia 241 229 142 211 Neamt 234 Lugoj Pitesti 97 Oradea 380 70 146 101 Mehadia 75 138 9181 yep 98 Pitesti 98 Hirsova 85 Rimnicu Vilcea 193 Urziceni 86 Sibiu 253 Bucharest Timisoara 329 120 Urziceni 80 Dobreta 90 Vaslui 199 Craiova Eforie ☐ Giurgiu Zerind 374 each of the following search strategies include, (a) Initial (Arad) (b) Goal. (c) Search tree (d) Path Taken (e) Path Returned (f) Path Cost (i) A* 1) Greedy Best First Compare Time, Optimality, Complexity and Completeness Section Carrow_forwardcontrol systemarrow_forward2.50. Let y[n] = x[n]* h[n]. Then show that x[nn] h[n-n₂] = y[n-n, -n₂] Hint: See Prob. 2.3. Show that no+N-1 = k=no x[n]x[n] x[k] x[nk] for an arbitrary starting point no. Hint: See Probs. 2.31 and 2.8.arrow_forward
- "2. In the following circuit R₁ = 2000, RL = 100k, n₁/n2 = 1/100, and vin (t) = 40 cos(wt)V, where w = 1000 rad/s: (a) Find the impedance Z₁. That is, the secondary impedance reflected to the primary. (b) Find the resistance seen by the source. (c) If Ry, is changed to 40k, find the value of n₁/n2 for maximum power transfer to RT. (d) Calculate the voltage in the primary and the secondary, V₂, and V, (where V, = Vout). (e) Calculate the currents I, and I, (primary and secondary)." vs(t) www R₁ 01:02 Z₁l ideal R₁ Voutarrow_forward"3. In the following circuit R₁ = 1500, R₂ = 6000, R₁ = 12k, n₁ n₂ = 1: 10, and Vin (t) = 5√2 cos(wt) V, where w = 2000π rad/s: (a) Find the impedance Z₁. (b) Find the phasor Vout (c) If Ry, is changed to 24k, find the value of n₁: n₂ for maximum power transfer." vs(t) ww R₁ R₂ 01:02 Z₁ ideal R₁> Voutarrow_forwardcontrol systemarrow_forward
- G = X^4+X+1 M = X^9+X^8+X^6+X^4+X^3+X+1arrow_forward2.52. The step response s(t) of a continuous-time LTI system is given by s(1) = [cos wol ]u(1) Find the impulse response h(t) of the system. Ans. h(t)=8(1) - wo[sin w₁t]u(t)arrow_forward2.48. Show that if y(t) = x(t)* h(t), then y' (t) = x' (1) * h(t) = x(t) * h'(t) Hint: Differentiate Eqs. (2.6) and (2.10) with respect to t. 2.49. Show that x(1) * 8'(t) = x(t) Hint: Use the result from Prob. 2.48 and Eq. (2.58).arrow_forward
- 2.47. Compute the convolution sum y[n] = x[n]+h[n] of the following pairs of sequences: (a) x[n] = u[n], h[n] = 2"u[n] (b) x[n]=u[n]-u[n-N], h[n]=a"u[n], 0 < a <1 (c) x[n]=()"u[n], h[n] = 8[n] - 8[n-1]arrow_forward"4. The load impedance connected to the secondary winding of the ideal transformer in the following circuit consists of a resistance of 237.5m2 in series with an inductor of 125µH. If the sinusoidal voltage source v, is generating the voltage 2500 cos(400t) V, calculate the steady-state equations for: (a) 21. (b) v1. (c) i₂, and (d) v2." 08 0,255 mH 237,5 m2 10:1 01 - Ideal 02 125 pharrow_forward"1. Formulate the matrix system to find the voltages and currents of the transformer in the following circuit. Hint: Use KVL (Kirchhoff's Voltage Law) in each winding of the transformer and use the voltage and current relationships." RT www pNp Ns Rc Vp idealarrow_forward
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