7.77 For the circuit shown in Figure P7.77, find the currents IĄ, Ig, Iç and In, and the real power dissipated by the load. 22020° V 4 20 2 40 2 j10 2 Ig 1102120° V 20 2 1102-120° V- I, wll
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- Figure 2 shows three "LC" circuits, two of them with capacitance capacitors "C" and the three with inductance coils "L", the three circuits are coupled by means of two capacitance capacitors "Cc". The currents that circulate through each mesh are those indicated in the figure: "I1", "I2" and "I3". Using Kirchhoff's law for voltages and taking into account the definition of current I = −dQ / dt, find the system of coupled equations of the system and then find the normal angular frequencies of the system.The waveforms below represent one full cycle of the applied voltage vs and the supply current is. based on the waveforms below, which of the following statements is true. options: is leads vs is lags vs is is in phase with vsaloulated m O1 the value you Up = A cos wt +1o Calaulate maarli)-min(i) =? Use constant voltage drop mad. Don7 to write units. . - 3.7V forget
- B.. What is the load current for the circuit shown in the figure? Please choose one: a. 6.0 mA b. 3.0 mA C. 9.0 mA D. 7.5 mA7.19 If the circuits shown in Figure P7.19 are to be at unity power factor, find Cp and Cs. Cs Rz RL Vs or Load Source ! Load Source R = 52, X, = 50, vs(t) = 100 sin(377f) V нЕA utility company plans to connect a total of 20uF of capacitance to a 7200 volt line. To make this connection four capacitors will be connected in series. What is the capacitance of each capacitor? Answer is 80uF. Now what is the minimum AC voltage rating of each capacitor?
- 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 source voltage and the current through the circuit? a. Insufficient information is given. b. The source voltage will lag the current. c. The source voltage will lead the current. d. The source voltage will be in-phase with the current.For the network shown in figure (3), if the switch is closed for 2usec and then opened for Susec, find mathematical expressions for vi and in of both periods of time and then plot the waveforms of vL and i as a function of time.Given the waveform of a voltage source shown in figure P7.8 find: a. The steady DC voltage that would cause the same heating effect across a resistance. b. The average current supplied to a 10-ohm resistor connected across the voltage source. c. The average power supplied to a 1-ohm resistor connected across the voltage source.
- Which of the following is true about all series ac circuits?(a) The voltage across any circuit element is a maximumwhen the current is a maximum in that circuit element.(b) The current at any point in the circuit is always thesame as the current at any other point in the circuit.(c) The current in the circuit is a maximum when thesource ac voltage is a maximum.(d) Resistors, capacitors, and inductors can all change thephase of the current.7.18 A single-phase motor draws 220 W at a power factor of 80 percent (lagging) when connected across a 200-V, 60-Hz source. A capacitor is connected in parallel with the load to give a unity power factor, as shown in Figure P7.18. Find the required capacitance. ell ww1. Enumerate five formulas for series-parallel capacitances across Vt source and draw the circuit. 2. Enumerate five formulas for parallel-series capacitances across Vt source and draw the circuit.