E6_1 - NANYANG TECHNOLOGICAL UNIVERSITY Expt E6 Energy...

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±±±±±±±±±±±±±±±±±±±±± NANYANG TECHNOLOGICAL UNIVERSITY ±±±±±±±±±±±±±±±±±±±±± Expt E6 : Energy, Power and Power Factor of a Fan Motor FORMAL LABORATORY REPORT
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Student : Sim Chin San David Class : A11b/AL22 Date : 02 Nov 1992 CONTENT PAGE 1. Introduction 2. Objective 3. Theory 4. Equipment 5. Experimental Procedures 5.1 Set up of Experiment 5.2 Measurement of Voltage, Current and Energy 5.3 Measurement with power factor correcting capacitor 6. Table of Results 7. Questions and Answers, and Graphs 7.1.1 Phasor diagram for High Speed 7.1.2 Phasor diagram for Medium Speed 7.1.3 Phasor diagram for Low Speed 7.2 Low Power Factor 7.3 Case Study 8. Discussions 9. 10. References 11. Appendices Appendix A : Circuit Diagram.
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1. INTRODUCTION Alternating current is presently the most commonly used form of electrical energy in our daily life. It has a few advantages over the use of direct current in that it is much easier to store, may be transmitted over a large distance with very little energy losses and its applications may be applied to many forms of other physics and engineering theory and practical applications. In our daily life now, we are always interested in knowing how much power does the appliances we used take up. Since, our daily appliance now running on alternating current. It is therefore important that we understand the concept of electrical power and power factor of an alternating supply source. 2. OBJECTIVES The aim of the experiment is to make measurement of a household fan at different speed using a household electric energy meter, a voltmeter, a phase angle meter and ammeters, and to observe the effect of a power factor correction capacitor. 3. THEORY The experiment involves the study of the most common domestic appliance, the energy meter and the power factor of the appliance. In addition, methods of improvement for the power factor of the appliance is also to be studied. The instantaneous power of any electric circuit is the product of the instantaneous voltage and current. In a d.c. circuit, the voltage and current are constant and therefore Average power is the product of the voltage and current (P = V.I). In a.c. circuit, due to the sinusoidal supply, there is a phase difference between the voltage v and current i which is φ , therefore the Average power of the circuit is given as P = V rms .I rms cos φ where V rms is the root means square voltage I rms is the root means square current
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φ is the phase difference or phase angle P is the average power of the circuit The unit of average power is the watts(W) or kilowatts(kW) In practise the value of V rms and I rms can be easily measured and the product of V rms and I rms is the apparent power of the circuit and the unit of this apparent power is voltamperes or kilovoltamperes. Thus we can conclude that the average power can never be greater than the apparent power and will be equal to the average power when there is no phase difference between the voltage and current source. The power factor of a circuit is the ratio of the average power to the apparent power
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This note was uploaded on 10/18/2009 for the course ECONS 111 taught by Professor Yo during the Spring '09 term at Nassau CC.

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E6_1 - NANYANG TECHNOLOGICAL UNIVERSITY Expt E6 Energy...

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