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(i) Scenario A company manufacturing extra low voltage fluorescent fittings is looking at improving the adaptability and efficiency of their product. The circuit shown below is for a typical ELV fluorescent lamp fitting, which operates at 24V 50Hz. Assuming the fluorescent tube has an operating resistance of 300 and an ideal transformer, determine: a. the current supplied by the source b. the impedance seen at the supply (HV side) c. the power dissipated by the tube d. the operating power factor of the fitting 2 Supply 230V RMS C=20μF 24V rms 50Hz Choke L = 130mH r = 90 Fluorescent Tube

(i) Scenario A company manufacturing extra low voltage fluorescent fittings is looking at improving the adaptability and efficiency of their product. The circuit shown below is for a typical ELV fluorescent lamp fitting, which operates at 24V 50Hz. Assuming the fluorescent tube has an operating resistance of 300 and an ideal transformer, determine: a. the current supplied by the source b. the impedance seen at the supply (HV side) c. the power dissipated by the tube d. the operating power factor of the fitting 2 Supply 230V RMS C=20μF 24V rms 50Hz Choke L = 130mH r = 90 Fluorescent Tube

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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d View Saved to this PC F-XChange (iv) Search (Alt+Q) If the capacitor is now removed from the above circuit and is placed in parallel with the secondary of the transformer, recalculate a to d in questio Using a scale phasor diagram prove your answer to part (ii) d. and evaluate each technique for determining circuit power factor. Write a brief report of your findings in parts (i) to (ii) which will be submitted to the company director (200 words). After reading the report in part (iv) the director asks why the fitting cannot simply be connected to a dc supply and the choke replaced by a resistor. In a written reply to this, explain the operating principle of the transformer in the above circuit and the operating principle and purpose of the choke when used in conjunction with a starter switch in a fluorescent switch start circuit, with particular reference to electro-magnetic induction and induced emfs.
Transcribed Image Text:d View Saved to this PC F-XChange (iv) Search (Alt+Q) If the capacitor is now removed from the above circuit and is placed in parallel with the secondary of the transformer, recalculate a to d in questio Using a scale phasor diagram prove your answer to part (ii) d. and evaluate each technique for determining circuit power factor. Write a brief report of your findings in parts (i) to (ii) which will be submitted to the company director (200 words). After reading the report in part (iv) the director asks why the fitting cannot simply be connected to a dc supply and the choke replaced by a resistor. In a written reply to this, explain the operating principle of the transformer in the above circuit and the operating principle and purpose of the choke when used in conjunction with a starter switch in a fluorescent switch start circuit, with particular reference to electro-magnetic induction and induced emfs.
(i) Scenario A company manufacturing extra low voltage fluorescent fittings is looking at improving the adaptability and efficiency of their product. The circuit shown below is for a typical ELV fluorescent lamp fitting, which operates at 24V 50Hz. Assuming the fluorescent tube has an operating resistance of 300 and an ideal transformer, determine: a. the current supplied by the source b. the impedance seen at the supply (HV side) c. the power dissipated by the tube d. the operating power factor of the fitting Supply 230V RMS C=20μF 24V rms 50Hz Choke L = 130mH r = 90 Fluorescent Tube
Transcribed Image Text:(i) Scenario A company manufacturing extra low voltage fluorescent fittings is looking at improving the adaptability and efficiency of their product. The circuit shown below is for a typical ELV fluorescent lamp fitting, which operates at 24V 50Hz. Assuming the fluorescent tube has an operating resistance of 300 and an ideal transformer, determine: a. the current supplied by the source b. the impedance seen at the supply (HV side) c. the power dissipated by the tube d. the operating power factor of the fitting Supply 230V RMS C=20μF 24V rms 50Hz Choke L = 130mH r = 90 Fluorescent Tube
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