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- Two impedances are connected in parallel to the supply; the first takes a current of40A at a lagging phase angle of 300, and the second a current of 30A at a leadingphase angle of 450. Draw a phasor diagram to scale to represent the supply voltageand these currents. By calculation, determine the total current taken from the supplyand its phase angle. All currents are expressed in their r.m.s. valuesThe voltage across a load is Vt : 104/2 cos(wt +75°), and the current through the load is ¡(t) = 2/2 cos(wt + 30°). The reference direction for the current points into the positive reference for the voltage. Determine the complex power and if this load is inductive or capacitive? S = 14140 + jl14140 Inductive S = 40000Z45° %3D Сараcitive S = 2000Z105° Сараcitive S = 5000 – j5000 InductiveQuestion 1: Based on figure below: a. Find the total impedance Z, in polar form b. Draw the impedance diagram c. Find the current I and voltages VR, V, and Vc in phasor form d. Draw the phasor diagram of the voltages E, VR, Viand Vc, and the current I. e. Verify Kirchhoff's voltage law around the closed loop. f. Find the average power delivered to the circuit g. Find the power factor of the circuit, and indicate whether it is leading or lagging. h. What happened if Xc= 20 ? Please explain. R- 40 X, = 6N Xc = 10 N %3D + UR + UL + vc e = 70.7 sin 377t|
- a. Find the total admittance and impedance in polar form b. Draw the admittance and impedance diagram c. Find the voltage E and currents IR , IL , and Ic in phasor form d. Draw the phasor diagram of the currents Is, IR, IL and IC, and the voltage E. e. Verify Kirchhoff’s current law at one node f. Find the average power delivered to the circuit g. Find the power factor of the circuit, and indicate whether it is leading or lagging. h. What happened if R= 10 ΩThree Impedances each of (9 - j18)N are connected in mesh across a three-phase 415V ac supply. Determine the phase current, line current, active power, reactive power drawn from supply. Also draw the Phasor diagram for the mesh connection and marks the Line current ,phase current line voltage and phase angle between phase current and pahse voltage. phase current (Ip) Line current real power reactive powerThe instantaneous power absorbed by the load in a single-phase ac circuit, for a general R LC load under sinusoidal-steady-state excitation. is (a) Nonzero constant (b) Zero (c) Containing double-frequency components
- Let a 100V sinusoidal source be connected to a series combination of a 3 resistor, an 8 inductor, and a 4 capacitor. (a) Draw the circuit diagram. (b) Compute the series impedance. (C) Determine the current I delivered by the source. Is the current lagging or leading the source voltage? What is the power factor of this circuit?The phase b voltage and the phase b current of a balance three-phase system are V = 220 sin (wt + 210°) and I = 10 sin (wt-180°). * A. 5256.44 W B. 5514.38 W C. 5715.76 W D. 6049.22 W= = Impedances Z₂ and z3 in parallel are in series with an impedance z₁ across a 100V,50Hz AC supply. Z₁ (6.25 +j1.25)ohms, Z₂ = (5 + j0)ohms and Z3 (5 - jxc)ohms. Determine the value of capacitance Xc said that the total current of the circuit will be in phase with the total voltage. What is then the circuit current and power?
- 1. Find the current and voltages Vr,Vl and Vc in phasor form. 2. Verify the kirchoffs volatage law around the closed loop. 3. Find the power factor of the circuit and indicate whether it os leading or laggingFor the given circuit: a.Find the total impedance ZTin polar form. b.Find the current I and the voltages VRand VLin phasor form. c.Find the power factor of the circuit, and indicate whether it is leading or lagging.Impedances Z1=5.83<-59 and Z2=8.94<63.43 are in series and carry and effective current of 5.0 A. Determine the power factor and state whether lagging or leading. Show your solutions.