Fundamentals of Electric Circuits
6th Edition
ISBN: 9780078028229
Author: Charles K Alexander, Matthew Sadiku
Publisher: McGraw-Hill Education
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Chapter 11, Problem 78P
Find the wattmeter reading of the circuit shown in Fig. 11.93.
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11.15 In the circuit of Fig. 11.46, find the value of Z, that
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Chapter 11 Solutions
Fundamentals of Electric Circuits
Ch. 11.2 - Calculate the instantaneous power and average...Ch. 11.2 - A current A flows through an impedance Find the...Ch. 11.2 - In the circuit of Fig. 11.4, calculate the average...Ch. 11.2 - Calculate the average power absorbed by each of...Ch. 11.3 - For the circuit shown in Fig. 11.10, find the load...Ch. 11.3 - In Fig. 11.12, the resistor RL is adjusted until...Ch. 11.4 - Find the rms value of the current waveform of Fig....Ch. 11.4 - Find the rms value of the full-wave rectified sine...Ch. 11.5 - Prob. 9PPCh. 11.5 - Prob. 10PP
Ch. 11.6 - For a load, Determine: (a) the complex and...Ch. 11.6 - A sinusoidal source supplies 100 kVAR reactive...Ch. 11.7 - In the circuit in Fig. 11.25, the 60- resistor...Ch. 11.7 - Two loads connected in parallel are respectively 3...Ch. 11.8 - Find the value of parallel capacitance needed to...Ch. 11.9 - For the circuit in Fig. 11.33, find the wattmeter...Ch. 11.9 - The monthly reading of a paper mills meter is as...Ch. 11.9 - An 500-kW induction furnace at 0.88 power factor...Ch. 11 - The average power absorbed by an inductor is zero,...Ch. 11 - The Thevenin impedance of a network seen from the...Ch. 11 - The amplitude of the voltage available in the...Ch. 11 - If the load impedance is 20 j20, the power factor...Ch. 11 - A quantity that contains all the power information...Ch. 11 - Reactive power is measured in: (a) watts (b) VA...Ch. 11 - In the power triangle shown in Fig. 11.34(a), the...Ch. 11 - For the power triangle in Fig. 11.34(b), the...Ch. 11 - A source is connected to three loads Z1, Z2, and...Ch. 11 - The instrument for measuring average power is the:...Ch. 11 - If v(t) = 160 cos 50t V and i(t) = 33 sin (50t ...Ch. 11 - Given the circuit in Fig. 11.35, find the average...Ch. 11 - A load consists of a 60- resistor in parallel with...Ch. 11 - Using Fig. 11.36, design a problem to help other...Ch. 11 - ssuming that vs = 8 cos(2t 40) V in the circuit...Ch. 11 - For the circuit in Fig. 11.38, is = 6 cos 103t A....Ch. 11 - Given the circuit of Fig. 11.39, find the average...Ch. 11 - In the circuit of Fig. 11.40, determine the...Ch. 11 - For the op amp circuit in Fig. 11.41, Find the...Ch. 11 - In the op amp circuit in Fig. 11.42, find the...Ch. 11 - For the network in Fig. 11.43, assume that the...Ch. 11 - For the circuit shown in Fig. 11.44, determine the...Ch. 11 - The Thevenin impedance of a source is ZTh = 120 +...Ch. 11 - Using Fig. 11.45, design a problem to help other...Ch. 11 - In the circuit of Fig. 11.46, find the value of ZL...Ch. 11 - For the circuit in Fig. 11.47, find the value of...Ch. 11 - Calculate the value of ZL in the circuit of Fig....Ch. 11 - Find the value of ZL in the circuit of Fig. 11.49...Ch. 11 - The variable resistor R in the circuit of Fig....Ch. 11 - The load resistance RL in Fig. 11.51 is adjusted...Ch. 11 - Assuming that the load impedance is to be purely...Ch. 11 - Find the rms value of the offset sine wave shown...Ch. 11 - Using Fig. 11.54, design a problem to help other...Ch. 11 - Determine the rms value of the waveform in Fig....Ch. 11 - Find the rms value of the signal shown in Fig....Ch. 11 - Find the effective value of the voltage waveform...Ch. 11 - Calculate the rms value of the current waveform of...Ch. 11 - Find the rms value of the voltage waveform of Fig,...Ch. 11 - Calculate the effective value of the current...Ch. 11 - Compute the rms value of the waveform depicted in...Ch. 11 - Find the rms value of the signal shown in Fig....Ch. 11 - Obtain the rms value of the current waveform shown...Ch. 11 - Determine the rms value for the waveform in Fig....Ch. 11 - Find the effective value f(t) defined in Fig....Ch. 11 - One cycle of a periodic voltage waveform is...Ch. 11 - Calculate the rms value for each of the following...Ch. 11 - Design a problem to help other students better...Ch. 11 - For the power system in Fig. 11.67, find: (a) the...Ch. 11 - An ac motor with impedance ZL = 2 + j 1.2 is...Ch. 11 - Design a problem to help other students better...Ch. 11 - Obtain the power factor for each of the circuits...Ch. 11 - A 110-V rms, 60-Hz source is applied to a load...Ch. 11 - Design a problem to help other students understand...Ch. 11 - Find the complex power delivered by vs to the...Ch. 11 - The voltage across a load and the current through...Ch. 11 - For the following voltage and current phasors,...Ch. 11 - For each of the following cases, find the complex...Ch. 11 - Determine the complex power for the following...Ch. 11 - Find the complex power for the following cases:...Ch. 11 - Obtain the overall impedance for the following...Ch. 11 - For the entire circuit in Fig. 11.70, calculate:...Ch. 11 - In the circuit of Fig. 11.71, device A receives 2...Ch. 11 - In the circuit of the Fig. 11.72, load A receives...Ch. 11 - For the network in Fig. 11.73, find the complex...Ch. 11 - Using Fig. 11.74, design a problem to help other...Ch. 11 - Obtain the complex power delivered by the source...Ch. 11 - For the circuit in Fig. 11.76, find the average,...Ch. 11 - Obtain the complex power delivered to the 10-k...Ch. 11 - Calculate the reactive power in the inductor and...Ch. 11 - For the circuit in Fig. 11.79, find Vo and the...Ch. 11 - Given the circuit in Fig. 11.80, find Io and the...Ch. 11 - For the circuit in Fig. 11.81, find Vs.Ch. 11 - Find Io in the circuit of Fig. 11.82. Figure 11.82Ch. 11 - Determine Is in the circuit of Fig. 11.83, if the...Ch. 11 - In the op amp circuit of Fig. 11.84, vs = 4 cos...Ch. 11 - Obtain the average power absorbed by the 10-...Ch. 11 - For the op amp circuit in Fig. 11.86, calculate:...Ch. 11 - Compute the complex power supplied by the current...Ch. 11 - Refer to the circuit shown in Fig. 11.88. (a) What...Ch. 11 - Design a problem to help other students better...Ch. 11 - Three loads are connected in parallel to a rms...Ch. 11 - Two loads connected in parallel draw a total of...Ch. 11 - A 240-V rms 60-Hz supply serves a load that is 10...Ch. 11 - A 120-V rms 60-Hz source supplies two loads...Ch. 11 - Consider the power system shown in Fig. 11.90....Ch. 11 - Obtain the wattmeter reading of the circuit in...Ch. 11 - What is the reading of the wattmeter in the...Ch. 11 - Find the wattmeter reading of the circuit shown in...Ch. 11 - Determine the wattmeter reading of the circuit in...Ch. 11 - The circuit of Fig. 11.95 portrays a wattmeter...Ch. 11 - Design a problem to help other students better...Ch. 11 - A 240-V rms 60-Hz source supplies a parallel...Ch. 11 - Oscilloscope measurements indicate that the peak...Ch. 11 - A consumer has an annual consumption of 1200 MWh...Ch. 11 - A regular household system of a single-phase...Ch. 11 - A transmitter delivers maximum power to an antenna...Ch. 11 - In a TV transmitter, a series circuit has an...Ch. 11 - A certain electronic circuit is connected to a...Ch. 11 - An industrial heater has a nameplate that reads:...Ch. 11 - A 2000-kW turbine-generator of 0.85 power factor...Ch. 11 - The nameplate of an electric motor has the...Ch. 11 - As shown in Fig. 11.97, a 550-V feeder line...Ch. 11 - A factory has the following four major loads: A...Ch. 11 - A 1-MVA substation operates at full load at 0.7...Ch. 11 - Prob. 95CPCh. 11 - A power amplifier has an output impedance of 40 +...Ch. 11 - A power transmission system is modeled as shown in...
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- For the circuit in Fig. 11.79, find Vo, and the input power factor.arrow_forward1. Voltage between 1 kV and 50 kV is defined as: A.Very High Voltage B.Medium Voltage C.Low Voltage D.High Voltage A factory consumes 400, 000 kVAh in a year witth the yearly average power factor 0.75. Calculate the average demand and percentage of annual load factor if the maximum demand is 120kW. A.Average demand = 44.25kW, Load factor = 29% B.Average demand = 44.25kW, Load factor = 39% C.Average demand = 34.25kW, Load factor = 29% D.Average demand = 34.25kW, Load factor = 39% The example of low voltage system is: A.Three-phase, 4-wire, 415 V, up to 45 kVA maximum demand B.Three-phase, 3-wire, 66 kV, 132 kV and 275 kV for exceptionally large load of 25 MVA maximum demand C.Three-phase, 3-wire, 11 kV for load of 1000 kVA maximum demand and above D.Three-phase, 3-wire, 22 kV or 33 kV for load of 5000 kVA maximum demand and above A load rises from zero to 20 kW instantaneosly and stays constant for 2 minutes, then rises about 40…arrow_forwardQ2) A three phase load (motor) draws 30 kW when connected to 440 V rms, 50 Hz line if the power factor is 0.85 lagging, Determine: a) The line current drawn by the motor. b) The KVAR rating of the three capacitors - connected in parallel with the motor that will raise the power factor to 0.95 lagging, and c) The capacitance of each capacitor.arrow_forward
- 115. Using nodal analysis, find the current through 82 resistor in the circuit shown in Fig. 11. 202 [M.D. Univ. Electrical Technology First Semester (E Scheme) New Examination 2006-07 [Ans. 0.82934 A 30 10 V www. 10 V 892 www wwww ៨ 252 Fig. 11 wwww 502 www 352 25 Varrow_forwardA load of 500 kVA operates on 1100 V, 50 Hz mains with power factor of 0.6 lagging. It is required to improvethe factor to 0.95 lagging by using the delta connected capacitor bank. Assuming that the load KVA remainsconstant, suggest the rating of the capacitors. Also find the additional kW that can be supplied.arrow_forwardA load in a factory consists of the following i. 9kW of lighting at unity power factor ii. A 12kVa motor at 0.75 p.f. lagging iii. A number of small motors taking 15kW at 0.6 p.f. lagging. The loads are balanced over the three phases of a 414V supply system. Determine A. The total kW B. The total kVar C. The overall kVa D. The overall power factor E. The line current. F. Draw the final power triangle of the combined loadarrow_forward
- HW16 11.18 Find the value of Z, in the circuit of Fig. 11.49 for maximum power transfer. 40 Ω 60/0° V -j10 2 40 Ω 80 2 ww j20 Ω 5/0° Aarrow_forwardHW25 11.74 A 120-V ms 60-Hz source supplies two loads connected in parallel, as shown in Fig. 11.89. (a) Find the power factor of the parallel combination. (b) Calculate the value of the capacitance connected in parallel that will raise the power factor to unity. Load 1 Load 2 24 kW 40 kW pf = 0.8 lagging pf = 0.95 laggingarrow_forwardIn the circuit of Fig. 11.4, calculate the average power absorbed by the resistor and inductor. Find the average power supplied by the voltage source. 392 www 320/45° V j192arrow_forward
- please answer in full solutionarrow_forward6. An 8 pole, 30 diesel generator has a line voltage of 450V at 62.5 Hz when its circuit breaker is open. At full load it supplies a line current of 410 Amps at a power factor of 0.83 lagging, its line voltage droops to 440V and the frequency droops to 60.0 Hz. The generator's full load efficiency is 85%. The efficiency of the diesel engine is 36%. a) What is the generator's % voltage regulation? b) What is the diesel engine's no load speed RPM, its full load speed RPM and its % speed regulation? c) What is the alternator's output apparent kVA, active kW, and reactive kvar power at full load? d) What is the full load output power in horsepower and shaft torque in kNm of the diesel engine? e) What are the power losses in the generator and diesel in kW? f) The diesel burns heavy fuel oil with a calorific value of 40.7 MJ/kg. Estimate the engine's fuel consumption in kg/hour at full load.arrow_forwardDetermine the ms value of the current waveform in Fig. 11.14. If the current is passed through a 2-2 resistor, find the average power absorbed by the resistor.arrow_forward
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