Problem #2) Determine the impedance values of the three "loads" and Vc in the following circuit if the source voltage is: R www ZR= Zc= 1)=30-sin(377-1-45°) volts. R=2052 L=50mH C-100uF Zt= VL=
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- Find the following: the power drawn by the 100ohm variable resistor If the variable resistor is set to 200-ohms, instead of 100-ohms, What is the power drawn by the 200-ohms resistor? total current of the system Is the circuit inductive, capacitive, or neither (resistive)? NOTE: Polar form for Voltage & Current. Rectangular form for ImpedanceA 60Hz sourcewith an effective voltage of 240 volts supplies 4500 volt-amp to a load with a p.f. of 0.75 lagging. Determine the parallel capacitance required to improve the power factor to: a) 0.9 lagging and b) 0.9 leading. What per cent reduction in line current resulted in part (a)?Sketch the complete phasor diagram showing the branch currents (IA, IB and IC) and voltages (VC and VAB) and the total voltage (V) for the circuit diagram shown in Figure 1.
- Problem 6: Suppose the voltage source for a series RL-circuit were given as V0sin(ωt) instead of V0cos(ωt). Part (a) Enter an expression for the current amplitude in terms of V0, ω, R, and L. I0 = ______ Part (b) Calculate the current amplitude, in milliamperes, when V0 = 1.9 V, ω = 45 rad/s, R = 29 Ω, and L = 0.84 H. I0 = ______ Part (c) Enter an expression for the tangent of the phase constant in terms of ω, R, and L. tanφ = ______ Part (d) Calculate the phase constant, in radians in the range -π/2 ≤ φ ≤ π/2, for the circuit parameter values given in part (b). φ = ______α=4 β=4For the adjacent circuit, Vab=(400+5β)V is given and the source part is balanced. Since it is known as ZAN=j2α Ω, ZBN= 3α Ω and ZCN=-j3α Ω, calculate the value of the current Ib by its angle, ignoring the impedances of the transmission lines.Can you please post your solutions, it's very importantSketch the phasor diagram of the above circuit in terms of impedance, voltage, and the power triangle.
- 41. Ideal inductors and capacitors are in phase with each other. True False "By the convention we are using in this course, if the reactance (X) is positive, it is inductive in nature." True False In series-connected ac circuit, the total current though the circuit is always equal to the phasor sum of the individual current though each element." True False "In a R-L series circuit, R=10 ohms and X=10 ohms, the applied voltage is in phase to the circuit total current (assumed applied voltage is the reference)." True False73. In phasor, the resistance has an angle of 90 degrees and the voltage and current are in phase." True False 74. The impedance (Z) of a circuit is the ratio of the phasor current to the phasor voltage. True False 75. Conductance is always expressed as a real number and comprised the real part of impedance equation. True FalseImpedances Z2 and Z3 in parallel are in series with impedance Z1 across a 100 V, 50 Hz acsupply. Z1 =6.25 + j 1.25 ohm; Z2 = 5 + j0 ohm and Z3 = 5 – jXc ohm. Determine the value ofcapacitance of Xc such that the total current of the circuit will be in phase with the totalvoltage. When is then the circuit current and power.
- (a) Calculate the equivalent impedance of the circuit given below, if the source voltage is v(t) = 60cos1000t (b) Calculate the source current flowing in the circuit (c) Draw the phasor diagram of the current and input voltageWhich termination would result to a phase change of 180 degrees at the load if Zo = 100 ohm? a. 50 ohm b. short circuit c. 75 ohm d. all of these What is the purpose of impedance matching? a. maximum return loss b. maximum SWR c. maximum load power d. maximum reflection A short piece of transmission line that may be open or shorted and used for impedance matching purposes. a. converter b. decoder c. stub d. transformerA series circuit of RLC with following parameters, R=15 ohm, L=20 m H & C=100 micro Farad. VT=169.7 sin (337t-30) Volt. Find the following: Zt, , It, Voltage across each element, Power factor, apparent power, real or average power and reactive power and the total phasor diagram and power phasor diagram