3. Three non-inductive resistances, each of 100 Q, are connected in star to a three- phase, 440-V supply. Three inductive coils, each of reactance 100 Q connected in delta are also connected to the supply. Calculate the line currents and the overall power factor of the system.
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- 50. A series resistance-capacitance (R-C) circuit is connected to 230-volt, 50 cycle AC source. The current through the resistor is 45.45 A and the power taken by the circuit is 5,000 watts. Compute the following: a. Ohmic value of the resistor b. Capacitive reactance E. capacitance in microfaradUse 3 decimal places and box the final answer. A 4-ohm resistor is in series with a 7.96-mH inductor connected across a 110-V 60-Hz source. Determine : a) the impedance b) the input current c) the voltage across the resistor and the inductor d) Draw the phasor diagram showing the current and the voltages. e) The power factor and the power input to the circuit.Two impedance coils A and B are connected in series to a 111-volt ac source. Coil A has a resistance of 12 ohms and an inductive resistance of 16 ohms. Coil B has a resistance of 24 ohms and an inductive reactance of 10 ohms. Calculate the voltage drop across each coil. Only in rectangular form
- In a series AC resistive circuit: a) voltage leads current by 90°(degrees). O b) current leads voltage by 90°(degrees). © current and voltage are in phase. d) d current and voltage cancel.57. An RLC series circuit connected to a 110-volt and 50-cycle AC source, contains the following series resistances and reactances: R1=10 ohm, R2= 15, XL1=20 ohms, XL2=25 ohms, XC= 40 ohms. Find the following a. Total inductance in millihenry b. total current c. reactive powerA sinusoidal voltage with effective value (73 V), and a Frequency its value (80 Hz), was applied on a series circuit that consists of a coil with inductance of value (0.05 H), and a resistor of value (5 N). Calculate: 1. The maximum value of the voltage? 2. The inductive reactance of the coil? 3. The electric impedance of the circuit? 4. The maximum value of the generated current in the circuit? 5. The phase angle? 6. The power factor? 7. The power dissipated inside the coil? 8. Draw a diagram showing the results?
- A 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. What is the minimum AC voltage rating of each capacitor? Answer is 1200 volts. What is the current flow through the circuit? And what is the minimum kVAR rating of each capacitor?2. A cisuuit condirest of rescistance Rohm and an inductanceL henmy connected to a generator of the urrent in the ciocuit Ecoclwr ta) votrage. FuindA three-phase generator is connected to three 90 Q load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line? Select one: O a. 2.66A O b. 1.33A C. 3.99A d. 0 A
- An electromagnet consists of a coil with a laminated core assembly. This device takes 6 A when connected to a 120 V DC course. When energized from a 120 V, 60 Hz AC source, the current is 2 A. The wattmeter reads 100 W. Determine the true ohmic resistance of the coil and the effective resistance of the coil. Explain why there is a difference between the true ohmic resistance and the effective resistance values for the same coil windingAnswer the following: a. A capacitance is connected to a 115 V, 25 Hz mains and takes a current of 5 A. find the current when both the capacitance and frequency are doubled. b. A 220 V, 60 Hz circuit draws a current of 11 A with a power factor of 0.8 lagging. Find the resistance of the circuit.A sinusoidal voltage with effective value (73 V), and a Frequency its value (80 Hz), was applied on a series circuit that consists of a coil with inductance of value (0.05 H), and a resistor of value (5 0). Calculate: 1. The maximum value of the voltage? 2. The inductive reactance of the coil? 3. The electric impedance of the circuit? 4. The maximum value of the generated current in the circuit? 5. The phase angle? 6. The power factor? 7. The power dissipated inside the coil? 8. Draw a diagram showing the results?