Loose Leaf for Engineering Circuit Analysis Format: Loose-leaf
9th Edition
ISBN: 9781259989452
Author: Hayt
Publisher: Mcgraw Hill Publishers
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Chapter 11, Problem 45E
Calculate the apparent power, power factor, and reactive power associated with a load if it draws complex power S equal to (a) 1 + j0.5 kVA; (b) 400 VA; (c) 150∠−21°VA; (d) 75∠25°VA.
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c) A heater with resistance 10 N is driven by an AC voltage source (120 V). For the circuit shown
below, determine the following:
0.50
j5n
Vs
120 V/50 Hz
j1n
Figure Ql
i. The total circuit impedance, Zr, in polar form.
11. The supply current, I..
iiI. The phasor diagram indicating the supply voltage, V, and the supply current,
17
iv. Apparent Power, Real Power, Reactive Power and Power Factor.
V. The heater output power.
100
1.
-) A sinusoidal voltage source in placed in series with a DC voltage source and produces
an output of:
v(t) = 70.7cos (377t) + 20 volts
[ 70.7 = 50√2]
Calculate:
a. v²(t)
b. Vrms
C. The magnitude of the RMS current if the combined source is placed across a load
of Z=4+j3 ohms (if you have trouble with part b, just assume a voltage of 100
Vrms for part c)
The voltage across three component in a series circuit when connected across an AC supply are
v1
= 30 sin (300nt -") volts
v2 = 40 sin(300nt +
volts
v3 = 50 sin(300rnt +
volts
Calculate the a) supply voltage in sinusoidal form, b) the frequency of the supply, and the periodic time
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Chapter 11 Solutions
Loose Leaf for Engineering Circuit Analysis Format: Loose-leaf
Ch. 11.1 - A current source of 12 cos 2000t A, a 200 ....Ch. 11.2 - Given the phasor voltage across an impedance ,...Ch. 11.2 - Prob. 3PCh. 11.2 - Prob. 4PCh. 11.2 - A voltage source vs is connected across a 4...Ch. 11.3 - If the 30 mH inductor of Example 11.7 is replaced...Ch. 11.4 - Calculate the effective value of each of the...Ch. 11.5 - For the circuit of Fig. 11.16, determine the power...Ch. 11.6 - Prob. 10PCh. 11 - Prob. 1E
Ch. 11 - Determine the power absorbed at t = 1.5 ms by each...Ch. 11 - Calculate the power absorbed at t = 0, t = 0+, and...Ch. 11 - Three elements are connected in parallel: a 1 k...Ch. 11 - Let is = 4u(t) A in the circuit of Fig. 11.28. (a)...Ch. 11 - Prob. 6ECh. 11 - Assuming no transients are present, calculate the...Ch. 11 - Prob. 8ECh. 11 - Prob. 9ECh. 11 - Prob. 10ECh. 11 - The phasor current I=915mA (corresponding to a...Ch. 11 - A phasor voltage V=10045V (the sinusoid operates...Ch. 11 - Prob. 13ECh. 11 - Prob. 14ECh. 11 - Find the average power for each element in the...Ch. 11 - (a) Calculate the average power absorbed by each...Ch. 11 - Prob. 17ECh. 11 - Prob. 18ECh. 11 - Prob. 19ECh. 11 - The circuit in Fig. 11.36 has a series resistance...Ch. 11 - Prob. 21ECh. 11 - Prob. 22ECh. 11 - Prob. 23ECh. 11 - Prob. 24ECh. 11 - Prob. 25ECh. 11 - Prob. 26ECh. 11 - Prob. 27ECh. 11 - Prob. 28ECh. 11 - Prob. 29ECh. 11 - Prob. 30ECh. 11 - Prob. 31ECh. 11 - Prob. 32ECh. 11 - Prob. 33ECh. 11 - (a) Calculate both the average and rms values of...Ch. 11 - Prob. 35ECh. 11 - FIGURE 11.43 Calculate the power factor of the...Ch. 11 - Prob. 37ECh. 11 - Prob. 38ECh. 11 - Prob. 40ECh. 11 - Prob. 41ECh. 11 - Prob. 42ECh. 11 - Prob. 43ECh. 11 - Compute the complex power S (in polar form) drawn...Ch. 11 - Calculate the apparent power, power factor, and...Ch. 11 - Prob. 46ECh. 11 - Prob. 48ECh. 11 - Prob. 49ECh. 11 - Prob. 50ECh. 11 - Prob. 51ECh. 11 - Prob. 52ECh. 11 - FIGURE 11.49 Instead of including a capacitor as...Ch. 11 - Prob. 54ECh. 11 - A load is drawing 10 A rms when connected to a...Ch. 11 - For the circuit of Fig. 11.50, assume the source...Ch. 11 - Prob. 57ECh. 11 - A source 45 sin 32t V is connected in series with...Ch. 11 - Prob. 60ECh. 11 - FIGURE 11.51 The circuit in Fig. 11.51 uses a Pi...Ch. 11 - Prob. 62ECh. 11 - Prob. 63ECh. 11 - You would like to maximize power transfer to a 50 ...
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- The voltage represented by e = 240 Sin(377t) volts is connected across a 20 ohms resistor. The RMS current indicated by a modern DMM (digital multi-meter) is ... a) 24 A O b) 8.49 A O c) 12 A O d) 6 Aarrow_forwardA 440 V rms source supplies power to a load Z = 10 + j2 through a transmission line having a total resistance of 1.5 Q. a) the average and apparent power supplied to the load are kW and kVA respectively (round off your numerical answer to one decimal point) b) the average and apparent power lost in the transmission line are kW and kVA respectively (round off your numerical answer to one decimal point) c) the average and apparent power supplied by the source are kW and kVA respectively (round off your numerical answer to one decimal point) d) the power factor at which the source operates is (round off your numerical answer to three decimal point)arrow_forwardCircuit Diagram Computed Values Compute the expected power factor of the circuit given the different capacitance. R1 V1 500 220Vrms C1 60Hz oº 100μl L (RMS) Capacitance Real Power (UE) (Watts) mag (A) 40 ~ 30 20 2 11 100mH Reactive Power (Vars) Power Factorarrow_forward
- Q4) Determine the power and rms value for each of the following signals: a) (10 + 2sin3t )cos10t b) 10 sin5t cos10t c) 10 cos(100t +) + 16 sin(150t +=) d) ejat coswotarrow_forward. Problem 2 The voltage and current at the terminals of a circuit element are shown. a) Is this circuit element a resistor, inductor, or capacitor? Explain your answer. b) What is the size of the circuit element? (Ohms, Henrys, or Farads) c) What is the instantaneous power being delivered to the circuit at t=1.5 s.? d) What is the RMS value of the current? T 2mA 2.MA "W SV ((SOC) V 1 (100)arrow_forwardA sinusoidal alternating voltage of effective value of 250 V and a frequency of 60 hz. It crosses the zero axis in a positive direction when t=0. Determine a) the instantaneous value of voltage after 12.45 msec; b) the time taken to reach 275 V after a period; c) the time to reach a value of 300 V after a passing through maximum positive value.arrow_forward
- A series circuit of two pure elements has the following applied voltages and resulting currents of 162.635 sin (314.159t + 36.87°) volts and 35.355 sin (314.159t -16.26°) amperes respectively. Determine the: a. the voltage in polar and rectangular forms; b. the current in polar and rectangular forms; c. the circuit impedance, resistance and reactance; d. the apparent power, S in waveform equation; and e. P, Q, S, and pf of the circuit.arrow_forwardDiscuss the importance of reactive power in maintaining voltage levels in a power system.arrow_forward15.i. A coil with resistance, 30 and inductance, 12.7mH is connected across 230V, 50HZ AC supply. The power factor of the circuit is calculated as, a. 0.6 b. 1 C. 0.8 d. 0arrow_forward
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