a- Phase angle equal zero b- The applied voltage lead the current by 90°. c- The average power equal to zero. 4- In general, how would the phasor diagram of Figure 3.2 the frequency was raised? 5- In general, how would the phasor diagram of Figure 3. the frequency was lowered?
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- a. Using Ohm’s Law, compute the voltage and current for eachcomponent. Use the formula Z = Vt / It. b. Compute and record the magnitude and phase angle of the impedanceusing the equation Z= R + RL + jXL – JXC. Use 3uF for the value of C,1.006H for the value of L and for the resistance is computed based onthe specification of the lamp. c. Compute and record for the total power using the formula: Pcomputed = Scosθ d. Compute and record the reactive power and apparent power using theformula Scomputed = V2/ZQcomputed = √S2 − P2 e. Compute for the reactive power (measure) and apparent power(measured) using the formula.Q = PtanθS = P/ cos θ f. Compute the percent difference between the measure and the computedvalue of the impedance.1. What is the relationship of voltage and current (concerning phase angle) in a pure resistive circuit?AC Circuits Current, Voltage, Power, Power Factor and Phasor Diagrams. Consider the circuit shown in Figure 3. (i) Find the total impedance ZT as seen by the voltage source. (ii) Find the total current IT supplied by the source. (iii) Sketch phasor diagram of Vs and IT and State whether IT leads or lags Vs (iv) Determine the power factor angle for the circuit. 9. L R1 1002 0.213H IT Vs R3 1502 C 12020°V 22µF 60HZ R2 50Ω Figure 3 Answers |(1) Zr = (ii) IT= (iii)
- What is the phase relationship between the voltage and current in an AC resistive circuit?2. What is the phase relationship between the voltage and current in an AC resistive circuit?4) AC circuit analysis is performed as it was in DC except A) one must use phasors for the voltages and currents and use complex numbers for Impedance. B) one must use phasors for the impedance. C) complex numbers for the V/I ratio are used to represent the power. D) None of the aboveTask 3 A three phase, four wire star connected load consisting of: ZR: a resistor of 9500 in series with a 3H inductor ZB: a resistor of 1950 ZY: a resistor of 1950 in series with a 4µF capacitor Using the equipment available in the power lab (Room T017), connect the given load to a three-phase supply available in the lab and: 3.1. Determine the current of each line and the neutral current and measure the total power supplied by the source. 3.2. Analytically, calculate all currents and the total power and compare with those obtained in measurements. 3.3. Device a method and measure the waveform of the neutral current. Discuss the obtained waveform and the reason for any distortion in the waveform 3.4. Validate your calculations using computer simulation
- Based on Figures la,1b and 1c and RLC elements, write a discussion on voltage-current relations and power factor.A circuit consists of an AC voltage source, a 10-ohm resistor, and a capacitor, all connected in series. The magnitude of the impedance of the capacitor is also 10 ohms. Which of the following is true about the phase angle difference between the source voltage and the current through the circuit? a. Insufficient information is given. b. The phase angle difference will be zero degrees. c. The phase angle difference will be 45 degrees. d. The phase angle difference will be 90 degrees.1) What is the phase angle between the phases in an ideal 3-phase system?
- The values of the circuit elements are given below.Accordingly |I| What is its value (the maximum value of its current)? V=110 phase 40 VR1=10 ohmsR2=12 ohmsR3=14 ohmsL1=j15 ohmsL2=j8 ohmsM=j15 ohmsC1=-j5 ohmsC2=-j12 ohms60. An RLC series circuit connected to a 110-volt and 50-cycle AC source, contains the following series resistances and reactances: R1=10 ohm, R2= 15, XL1=20 ohms, XL2=25 ohms, XC= 40 ohms. Find the real power. a. 65.3899 b. 392.4372 c. 397.848 d. 588.655950. A series resistance-capacitance (R-C) circuit is connected to 230-volt, 50 cycle AC source. The current through the resistor is 45.45 A and the power taken by the circuit is 5,000 watts. Compute the following: a. Ohmic value of the resistor b. Capacitive reactance E. capacitance in microfarad