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Compute the amount of capacitance needed to correct  the power factor to 90%

Compute the amount of capacitance needed to correct  the power factor to 90%

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Compute the amount of capacitance needed to correct  the power factor to 90%

### Educational Worksheet: Electrical Circuit Analysis #### Instructions: 1. If possible, connect the amount of capacitance found in step 16 in parallel with the motor by closing the proper switches on the variable-capacitance module. Observe the action of the AC ammeter while doing this. 2. Measure the amount of true power in the circuit. __________ W 3. Measure the amount of voltage across the motor and the amount of circuit current. - \( E = \) __________ V - \( I = \) __________ A 4. Compute the circuit power factor. - \( PF = \) __________ % 5. **Turn off the power supply and disconnect the circuit.** 6. Return the components to their proper place. --- ### Review Questions 1. **Assume that a single-phase motor is connected to a 240-VAC line and has a current draw of 6 A. A wattmeter connected in the circuit indicates a true power value of 864 W. Compute the following values:** \( VA = \) __________ \( PF = \) __________ % \( VARs = \) __________ 2. **Using the values found in question 1, compute the amount of capacitive current needed in the circuit to correct the power factor to 90%.** \( I_c = \) __________ A 3. **Compute the amount of capacitive reactance needed to correct the power factor.** \( X_c = \) __________ Ω 4. **Compute the amount of capacitance needed to correct the power factor to 90%.** \( C = \) __________ μF --- This worksheet guides students through practical exercises for measuring and calculating electrical properties such as power, power factor, and capacitance in an AC motor circuit. Students are encouraged to apply concepts from electrical engineering theory to real-world scenarios, enhancing their analytical and problem-solving skills.
Transcribed Image Text:### Educational Worksheet: Electrical Circuit Analysis #### Instructions: 1. If possible, connect the amount of capacitance found in step 16 in parallel with the motor by closing the proper switches on the variable-capacitance module. Observe the action of the AC ammeter while doing this. 2. Measure the amount of true power in the circuit. __________ W 3. Measure the amount of voltage across the motor and the amount of circuit current. - \( E = \) __________ V - \( I = \) __________ A 4. Compute the circuit power factor. - \( PF = \) __________ % 5. **Turn off the power supply and disconnect the circuit.** 6. Return the components to their proper place. --- ### Review Questions 1. **Assume that a single-phase motor is connected to a 240-VAC line and has a current draw of 6 A. A wattmeter connected in the circuit indicates a true power value of 864 W. Compute the following values:** \( VA = \) __________ \( PF = \) __________ % \( VARs = \) __________ 2. **Using the values found in question 1, compute the amount of capacitive current needed in the circuit to correct the power factor to 90%.** \( I_c = \) __________ A 3. **Compute the amount of capacitive reactance needed to correct the power factor.** \( X_c = \) __________ Ω 4. **Compute the amount of capacitance needed to correct the power factor to 90%.** \( C = \) __________ μF --- This worksheet guides students through practical exercises for measuring and calculating electrical properties such as power, power factor, and capacitance in an AC motor circuit. Students are encouraged to apply concepts from electrical engineering theory to real-world scenarios, enhancing their analytical and problem-solving skills.
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