Concept explainers
If the switch shown in Figure P5.63 is closed at
determine the current
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Principles And Applications Of Electrical Engineering
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- What is the practical application of a circuit that you can tune such that it reaches some minimum resistance? Would there be an application to being able to tune where that minimum occurs, by changing the capacitance or inductance of the circuit?arrow_forwardThe 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_forwardFor the circuit of Figure P5.52, assume that thecircuit is at steady state for t < 0. Find the voltage across the 10-kΩ resistor in parallel with the switch for t ≥ 0.arrow_forward
- a) We assume that the switch is on. Calculate the reactance values and find the charging current in the circuit below. Is the circuit capacitive or inductive? Show that the voltage across the capacitance can be slightly larger than the source voltage U. (This is called the Ferranti effect and means that we can get a voltage rise beyond overhead lines with small loads. This is mostly relevant at the highest voltage levels. The frequency f is 50Hz, and assume voltage U= √2⋅24kVarrow_forwardAn 8 μF capacitor is a 200 V DC in series with a 0.5 MΩ resistorlinked to the source. According to this;a) τ =?b) Initial value of charging currentc) The time required for the voltage at the capacitor ends to become 160 V.d) 4 s after connecting to the source, i =? and Vc =? Calculate the values.arrow_forwardA solid specimen of dielectric dielectric constant of 4.0, shown in the figure has an internal void of thickness 1mm. The specimen is 1cm thick and is subjected to a voltage of 80 kV(rms). If the void is filled with air and if the breakdown strength of air can be taken as 30 kV(peak)/cm, find the voltage at which an internal dischargearrow_forward
- Assuming that a nonzero ac voltage source is applied, what can you say about whether the power and reactive power are positive, negative, or zero for a pure capacitance in series with a pure inductance? Consider cases in which the impedance magnitude of the capacitance is greater than, equal to, or less than the impedance magnitude of the inductance. Repeat Problem P5.74 for the inductance and capacitance in parallel.arrow_forwarda. The current and voltage for a certain circuit element are shown in Figure P5.38(a). Determine the nature and value of the element. b. Repeat for Figure P5.38(b).arrow_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_forward
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