Electric Circuits. (11th Edition)
11th Edition
ISBN: 9780134746968
Author: James W. Nilsson, Susan Riedel
Publisher: PEARSON
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Question
Chapter 7, Problem 49P
a)
To determine
Find the expression
b)
To determine
Find the expression
c)
To determine
Find the expression
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Fundimentals of Energy Systems Q8
Two wattmeters are used to measure power in a three
phase, three-wire network. Show by means of connection
and complexor (phasor) diagrams that the sum of the
wattmeter readings will measure the total active power.
Two such wattmeters read 120 W and 50 W when
connected to measure the active power taken by a balanced three-phase load. Find the power factor of the load.
If one wattmeter tends to read in the reverse direction,
explain what changes may have occurred in the circuit
ANS:
0.815
Fundimentals of Energy Systems Q7
Chapter 7 Solutions
Electric Circuits. (11th Edition)
Ch. 7.1 - The switch in the circuit shown has been closed...Ch. 7.1 - Prob. 2APCh. 7.2 - Prob. 3APCh. 7.2 - Prob. 4APCh. 7.3 - Prob. 5APCh. 7.3 - Prob. 6APCh. 7.4 - Prob. 7APCh. 7.4 - Prob. 8APCh. 7.5 - Prob. 9APCh. 7.5 - Prob. 10AP
Ch. 7.7 - There is no energy stored in the capacitor at the...Ch. 7.7 - Prob. 12APCh. 7 - Prob. 1PCh. 7 - In the circuit shown in Fig. P 7.2, the switch...Ch. 7 - Prob. 3PCh. 7 - The switch shown in Fig. P 7.4 has been open for a...Ch. 7 - Prob. 5PCh. 7 - For the circuit of Fig. P 7.5, what percentage of...Ch. 7 - Prob. 7PCh. 7 - In the circuit in Fig. P 7.8, the voltage and...Ch. 7 - Prob. 9PCh. 7 - Prob. 10PCh. 7 -
The switch in the circuit seen in Fig. P 7.11 has...Ch. 7 - In the circuit in Fig. P 7.11, let Ig represent...Ch. 7 - The two switches in the circuit seen in Fig. P...Ch. 7 - Prob. 14PCh. 7 - Prob. 15PCh. 7 - Prob. 16PCh. 7 - Prob. 17PCh. 7 - Prob. 18PCh. 7 - Prob. 19PCh. 7 - For the circuit seen in Fig. P 7.19, find
the...Ch. 7 - Prob. 21PCh. 7 - Prob. 22PCh. 7 - Prob. 23PCh. 7 - Prob. 24PCh. 7 - The switch in the circuit in Fig. P 7.25 is closed...Ch. 7 - In the circuit shown in Fig. P 7.26, both switches...Ch. 7 -
In the circuit in Fig. P 7.27 the voltage and...Ch. 7 - Prob. 28PCh. 7 - Prob. 29PCh. 7 - The switch in the circuit seen in Fig. P 7.30 has...Ch. 7 - In Problem 7.30 how many microjoules of energy are...Ch. 7 - Prob. 33PCh. 7 - Prob. 34PCh. 7 - Prob. 35PCh. 7 - Prob. 36PCh. 7 - Prob. 37PCh. 7 - The switch in the circuit shown in Fig. P 7.38 has...Ch. 7 - Prob. 39PCh. 7 - Prob. 40PCh. 7 - Prob. 41PCh. 7 - Prob. 42PCh. 7 - Prob. 43PCh. 7 - Prob. 44PCh. 7 - Prob. 45PCh. 7 - Prob. 46PCh. 7 - For the circuit in Fig. P 7.4, find (in...Ch. 7 - Prob. 48PCh. 7 - Prob. 49PCh. 7 - Prob. 50PCh. 7 - Prob. 51PCh. 7 - Prob. 52PCh. 7 - Prob. 53PCh. 7 - Prob. 54PCh. 7 - The switch in the circuit of Fig. P 7.55 has been...Ch. 7 - The switch in the circuit seen in Fig. P 7.56 has...Ch. 7 - Prob. 57PCh. 7 - Prob. 58PCh. 7 - Prob. 59PCh. 7 - The switch in the circuit shown in Fig. P 7.61 has...Ch. 7 - Prob. 62PCh. 7 - Prob. 63PCh. 7 - Prob. 64PCh. 7 - Prob. 65PCh. 7 - Prob. 66PCh. 7 - Prob. 67PCh. 7 - Prob. 68PCh. 7 - Prob. 69PCh. 7 - Prob. 70PCh. 7 - Prob. 71PCh. 7 - Prob. 72PCh. 7 - Prob. 73PCh. 7 - For the circuit in Fig. P 7.73, how many...Ch. 7 - Prob. 75PCh. 7 - Prob. 76PCh. 7 - Prob. 77PCh. 7 - Prob. 78PCh. 7 - Prob. 79PCh. 7 - Prob. 80PCh. 7 - Prob. 81PCh. 7 - Prob. 82PCh. 7 - Prob. 84PCh. 7 - Prob. 85PCh. 7 - Prob. 86PCh. 7 - Prob. 87PCh. 7 - Prob. 88PCh. 7 - Prob. 90PCh. 7 - Prob. 91PCh. 7 - Prob. 92PCh. 7 - Prob. 93PCh. 7 - Prob. 94PCh. 7 - Prob. 95PCh. 7 - Prob. 100PCh. 7 - Prob. 101PCh. 7 - Prob. 102PCh. 7 - Prob. 103PCh. 7 - Prob. 104PCh. 7 - Prob. 105PCh. 7 - Prob. 106PCh. 7 - Prob. 107P
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- If Va = 12V, Ve = 0V, R1= 10 Ohms, and R2=R3=5 Ohms, solve all currents, i, and voltages, V in the circuit.arrow_forward* 7.29 The current source in the circuit of Fig. P7.29 is given by is(t) = 12 cos(2л × 10¹t — 60°) mA. - Apply the phasor-domain analysis technique to determine ic(t), given that R= 20 2 and C = 1 μF.arrow_forwardPROBLEMS 7.33 Find ia(t) in the circuit of Fig. P7.33, given that Us(t) = 40 sin(200t -20°) V.arrow_forward
- 7.25 Determine the impedances of the following elements: (a) R 1 k at 1 MHz = (b) L= 30 μH at 1 MHz *(c) C = 50 μF at 1 kHzarrow_forwardDO NOT USE CHATGPT NEED HANDWRITTEN SOLUTIONarrow_forwardCheck the suitability of the cable cross sections with voltage drop calculation and current control methods. If they are not suitable, determine the suitable cable cross section by using given table. %e₁ 6mm² 25m AT KT1A %e2 %e3 6mm² 2,5mm² 15m 10m 15000W 7500W 2500W Num, of Cores Number of Thickness of Thickness of and Nominal Wires and Cross Section Diameter Insulation Overall Diameters in Approx Sheath Standards Overall Diameter Nox mm² Nox mm mm mm min max max. mm 2x0,75 22x0,20 0,6 0,80 5,7 7,2 6,4 2x1 30x0,20 0,6 0,80 5,9 7,5 6,6 2x1,5 27x0,25 0,7 0,80 6,8 8,6 7,4 2x2,5 45x0,25 0.8 1,00 8,4 10,6 9.2 2x4 50x0,30 0,8 1,10 9,7 12,1 11 2x6 75x0,30 0,8 1,10 11,8 13,1 12,4 2x10 73x0,40 0,9 1,20 14.6 15,8 15 3x0,75 22x0,20 0,6 0,80 6 7,6 6,8 3x1 30x0,20 0,6 0,80 6,3 8 7 3x1,5 27x0,25 0,7 0,90 7A 9,4 8,1 3x2,5 45x0,25 0,8 1,10 9,2 11,4 10 3x4 50x0,30 0,8 1,20 10,5 13,1 11,9 3x6 75x0,30 0.8 1,10 12,5 14,2 13,3 3x10 73x0,40 0,9 1,20 15,8 17,2 16,3 4x0,75 22x0,20 0,6 0,80 6,6 8,3 7,4 4x1…arrow_forward
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