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Principles and Applications of Electrical Engineering
- The inductor L in the circuit shown in Figure P5.36is the coil of a relay. When the current through the coilis equal to or greater than +2 mA, the relay functions.Assume steady-state conditions at t < 0. IfVS = 12 V, L = 10.9 mH, R1 = 3.1 kΩ determine R2 so that the relay functions at t = 2.3 s.arrow_forwardSolve for the node voltage shown in Figure P5.54.arrow_forwardThe Thévenin equivalent of a two-terminal network is shown in Figure P5.93. The frequency is f=60 Hz. We wish to connect a load across terminals that consists of a resistance and a capacitance in series such that the power delivered to the resistance is maximized. Find the value of the resistance and the value of the capacitance. Repeat Problem P5.93 with the load required to consist of a resistance and a capacitance in parallel.arrow_forward
- Consider the situation shown in Figure P5.85. A 1000-V-rms source delivers power to a load. The load consumes 100 kW with a power factor of 25 percent lagging. a. Find the phasor I, assuming that the capacitor is not connected to the circuit. b. Find the value of the capacitance that must be connected in parallel with the load to achieve a power factor of 100 percent. Usually, power-systems engineers rate capacitances used for power-factor correction in terms of their reactive power rating. What is the rating of this capacitance in kVAR? Assuming that this capacitance is connected, find the new value for the phasor I. c. Suppose that the source is connected to the load by a long distance. What are the potential advantages and disadvantages of connecting the capacitance across the load?arrow_forwardConsider the phasors shown in Figure P5.22. The frequency of each signal is f=200 Hz. Write a time-domain expression for each voltage in the form Vm cos(ωt+θ). State the phase relationships between pairs of these phasors.arrow_forwardConsider the circuit shown in Figure P5.79. Find the phasor current I. Find the power, reactive power, and apparent power delivered by the source. Find the power factor and state whether it is lagging or leading. Repeat Problem P5.79, replacing the inductance by a 10- μF capacitance.arrow_forward
- Find the rms value of the voltage waveform shown in Figure P5.17.arrow_forwardDetermine the power for each source shown in Figure P5.76. Also, state whether each source is delivering or absorbing energy.arrow_forwardThe equation of the charge on the capacitor at any time t for an LRC series circuits is givenas a) Assume there is no initial charge and current, sketch the graph of the charge. b) What happen to the charge after a long time? c) State the transient and the steady state terms.arrow_forward
- Describe the steady-state similarities and differences of DC and AC circuits with purelyresistive elementsarrow_forwarda. Find the Thévenin and Norton equivalent circuits for the circuit shown in Figure P5.89.b. Find the maximum power that this circuit can deliver to a load if the load can have any complex impedance. c. Repeat if the load is purely resistive.arrow_forwardCapacitance= 5uF1) Determine the time constant of the circuit for the capacities2) For the capacity value, calculate the estimated time to come to the final state.3) Plot capacitor current and voltage graphs and show if it works in harmony with the time constant you calculated. NOTE: if you want you can use falstad online circuit simulator.arrow_forward
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