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Calculate the instantaneous power and average power absorbed by the passive linear network of Fig. 11.1 if
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ECE 285/286:FUND ELCT CIRCUITS(LL)WACC
- (i) An alternating voltage E=200 Sin 314t is applied to a device which offers an ohmic resistance of 20Ω to the flow of current in one direction, while presenting the flow of current in opposite direction. Calculate; (a) Rms Value (b) Average Value (c) Form Factor for the current over one cyclearrow_forwardThe voltage applied to a coil having R = 200 ohms, L= 638 mH is represented by e= 20 sin 100 pi × t. Find a corresponding expression for the current and calculate the average value of the power taken by the coil.arrow_forwardAn alternating voltage given by v = 120 sin (240t + п / 4) V, is applied to a coil withnegligible resistance and inductance of 100 mH. Determine (a) the reactance of thecoil, and (b) the RMS current flowing through the circuit.arrow_forward
- 2) The net inlet to a factory powered by a 2300 volt infinite busis measured as 765 A, for a lag 0.92 power factor. although mostloads is inductive, the input power factor has been improved by installing asynchronous capacitor operating at its nominal value of 1000 KVA. Determine the factor oforiginal factory power.arrow_forwardProblem 11.34. At full load, a commercially available 106 hp, three-phase induction motor operates at an efficiency of 96% and a power factor of 0.87 lag. The motor is supplied from a three-phase outlet with a line-voltage rating of 208 V. 1. What is the magnitude of the line current in Ampere drawn from the 208 V outlet? (1 hp = 746 W). 2. Calculate the reactive power in kVAR supplied to the motor.arrow_forwardAn alternator is supplying 300 kW at a power factor of 0.6 lagging. If the power factor is raised to unity, how many more kilowatts can alternator supply for the same KVA loading.arrow_forward
- A supply voltage v given by v = (240 sin 314t + 40 sin 942t + 30 sin 1570t) volts is applied to a circuit comprising a resistance of 12 ohmconnected in series with a coil of inductance 9.55 mH. Determine (a) an expression to represent the instantaneous value of the current, (b) the rms voltage, (c) the rms current, (d) the power dissipated, and (e) the overall power factor.arrow_forwardAn electrical load operates at 240 Volts (rms). It absorbs an average power of 8kW at a lagging power factor of 0.8 (current lags voltage) a)Calculate the complex power of the load b)Calculate the impedance of the load, Zarrow_forwardThe three-phase average power rating of the central processing unit (CPU) on a mainframe digital computer is 22,659 W. The three-phase line supplying the computer has a line voltage rating of 208 V. The line current is 73.8 A. The computer absorbs magnetizing VARs. 1. a) Calculate the total magnetizing reactive power absorbed by the CPU. 2. b) Calculate the power factor.arrow_forward
- A group of small appliances on a 60 Hz system requires 20 kva at 0.85 lagging power factor when operated at 120 Vrms. The impedance of the wire supplying the appliances is (0.01 + j0.08) Ω. The voltage at the load end of the wire is 125 Vrms. Determine: a) the power loss in the wire, b) the capacitor in microfarad needed to improve the power factor to unity.arrow_forwardYour company has been chosen to supply a 50 Hz alternator to a European utility. The stator is wye connected with each phase winding having 36 turns of wire. The rotor is supplying 0.127 Wb of flux in the center of pole face. What is the rms value of the output voltage if measured line to linearrow_forwardAn e.m.f. whose instantaneous value at time t is given by v(t) = 283 sin (314t + π/4) volts is applied to an inductive circuit and the current in the circuit is i(t) = 5.66 sin (314t - π/6) amperes. Determine: (iii) the active power absorbed (in W)arrow_forward
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