It is desired to deliver only 45% of the power to a load (100% is obtained when the load is connected directly to the source) using the circuit shown. RL=16 Ohms, Vi=48VRMS 6OHZ and the variable resistor is 16 Ohms. Find the efficiency of the circuit which is load power over source power % RL a) 35.39 b) 23.59 c) 41.29 d) 29.49 e) 17.69
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- A circuit has resistance of 20 ohms and a reactance of 30 ohms. What is the power factor of the circuit? a. 0 b. 0.55 c. 0.832 d. 0.994. -Find: a) The total power triangle b) The total power factor. c) Total current intensity, before and after correction. d) The equivalent impedance of the circuit e) The KVAR necessary to correct the F.P to the unit. P4-0 W P1-650 W P2-950 W Q1--650 FP=0.85 at P3 800 W Q3700 Q4 750 VAR at VAR ad VT-220.0° VAR at2 b) A circuit takes a current of 3A at p.f of 0.6 lagging when connected to a 115 v, 50 Hz supply. Another circuit takes a current of 5 A at a p.f of 0.707 leading when connected to the same supply. If the two circuits are connected in series across a 230V, 50 HZ, Calculate- 1. The current 2. The power consumed 3. The p.f of the circuit
- For the circuit shown below, The maximum power supplied to the load resistor (Pmax)= 155 Watts and VTh = 65 V. RTh a ww IL VTh R1 The value of Thevenin Resistance RTh isPlease show your detailed solution Number 41 What is the “wattage” rating of a lamp whose hot resistance is 150 W when connected to a 117-V 25-Hz source? A. 64.53 W C. 129.06W B. 91.26 W D. 912.6 Wa. Using Ohm’s Law, compute the voltage and current for eachcomponent. Use the formula Z = Vt / It. b. Compute and record the magnitude and phase angle of the impedanceusing the equation Z= R + RL + jXL – JXC. Use 3uF for the value of C,1.006H for the value of L and for the resistance is computed based onthe specification of the lamp. c. Compute and record for the total power using the formula: Pcomputed = Scosθ d. Compute and record the reactive power and apparent power using theformula Scomputed = V2/ZQcomputed = √S2 − P2 e. Compute for the reactive power (measure) and apparent power(measured) using the formula.Q = PtanθS = P/ cos θ f. Compute the percent difference between the measure and the computedvalue of the impedance.
- For the circuit shown in Figure, find the following: a. The magnitude of current in the circuit, I. b. The total power delivered by the voltage source, P,. c. The value of the unknown resistance, R./ d. The power dissipated by each resistor. 1 ka 4 ko E- 90 V RT- 12 ka 3 ka2. The SONEL thermal plant in Limbe supplies SONARA with 1.0 MV at a p.d of 1.0 x 104v The total resistance between the power station and the factory is 0.52. a. What is the power output of the thermal plant b. Explain why the power station output voltage is always stepped up before transmission over a long distancelow voltage systems In the circuit shown in the figure, the internal resistance of a voltage source is given as 3 ohms. Load values are R = 20 ohms and XL = 20 ohms. VAB at load endsThe effective value of the voltage is 220 V. (Frequency is 50 Hz). What is the power factor of the load? (Do not take into account 3 ohms in calculations) a)0,707 b)0,8 c)0,782 d)0,825
- 1. What is the relationship of voltage and current (concerning phase angle) in a pure resistive circuit?Task 3 A three phase, four wire star connected load consisting of: ZR: a resistor of 9500 in series with a 3H inductor ZB: a resistor of 1950 ZY: a resistor of 1950 in series with a 4µF capacitor Using the equipment available in the power lab (Room T017), connect the given load to a three-phase supply available in the lab and: 3.1. Determine the current of each line and the neutral current and measure the total power supplied by the source. 3.2. Analytically, calculate all currents and the total power and compare with those obtained in measurements. 3.3. Device a method and measure the waveform of the neutral current. Discuss the obtained waveform and the reason for any distortion in the waveform 3.4. Validate your calculations using computer simulationAn impedance coil takes 10A and absorbs 250 W when connected across a 220V, 60Hz source. What power will it absorb when connected across 110 V, 25 Hz mains? a. 539 W b. 239 W c. 439 W d. 339 W