# E2_1 - NANYANG TECHNOLOICAL UNIVERSITY FIRST YEAR...

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NANYANG TECHNOLOICAL UNIVERSITY FIRST YEAR ENGINEERING FORMAL REPORT EXPERIMENT E2 : CIRCUIT LAWS AND TRANSIENT RESPONSE SUBMITTED BY : WONG PONG YEN ( 15 ) DATE OF EXPERIMENT : 14th AUG 1993 CLASS : A1b / AL2

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ABSTRACT The purposes of this experiment are to verify Kirchhoff's Laws and Thevenin"s Theorem.We also study the transient response of the RC series circuit to a square wave input. In the process to verify Kirchhoff's Laws and Thevenin's Thoerem , values of current and voltage are measured from a current which is then subsequently substituted into respective equations . On the other hand , the transient response of the RC circuit is verified by varying the values of the product RC and the frequency ƒ . TABLE OF CONTENTS TITLE PAGE ABSTRACT
TABLE OF CONTENTS Chapter 1.0 INTRODUCTION 1.1 OBECTIVES 1.1.1 To verify Kirchhofff's Laws and Thevenin's Theorem 1.1.2 To study the transient response of a series RC circuit Chapter 2.0 THEORY 2.1 KIRCHHOFF'S LAWS AND THEVENIN'S THEOREM 2.1.1 Kirchhof'f's Voltage Law (KVL) 2.1.2 Kirchhoff's Current Law (KCL) 2.1.3 Thevenin's Theorem 2.2 TRANSIENT RESPONSE OF A SERIES RC CIRCUIT Chapter 3.0 APPARATUS 3.1 Equipment provided 3.2 Voltmeter and ammeter Chapter 4.0 PROCEDURE 4.1 Kirchhoff's Laws 4.2 Thevenin's Theorem 4.3 Response of a series RC circuit to a square-wave input Chapter 5.0 CALCULATIONS AND RESULTS 5.1 Readings for Kirchhoff's Laws 5.2 Readings for Thevenin's Theorem 5.3 Readings for the study of the transient response of RC circuit Chapter 6.0 DISSCUSSIONS 6.1 Kirchhoff's Laws 6.2 Thevenin's Theorem 6.3 Transient response of a series RC circuit Chapter 7.0 CONCLUSIONS Chapter 8.0 REFERENCE Chapter 9.0 APPENDICES 1 INTRODUCTION 1.1 OBJECTIVES 1.1.1 To verify Kirchhoff's laws and Thevenin's Theorem 1.1.2 To test the transient response of a series Resistor-Capacitor 2 THEORY

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2.1 KIRCHHOFF'S LAWS AND THEVENIN'S THEOREM 2.1.1 Kirchhoff's Voltage Law (KVL) Kirchhofff's Voltage Law ( KVL ) provides the relationship between the branch( element ) voltages of a circuit . For a closed loop , Kirchhoff's Voltage Law states that algebraic sum of the voltages around that loop is zero . A closed loop is any closed path in a circuit . It may contain circuit elements like resistors , inductors, capacitors or other voltage and current sources. From the definition of KVL Σ V ( closed loop ) = 0-----(1) Consider Fig 1 below and applying KVL to loop L 1 , we have Σ V = - V 5 - V 3 - V 4 = 0 Fig 1 : Kirchhoff's Voltage Law In the application of KVL , one must take note of the polarities of the voltages of the resistors . The voltage polarity of a resistor is taken to be positive when the current flowing through it is in the same direction as the assigned loop current where the current is in. For resistor R 5 in Fig 1, the current I 5 is taken to be flowing from c to a.Then the voltage V 5 is taken to be negative as the loop direction L 1 is in the opposite direction.
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E2_1 - NANYANG TECHNOLOICAL UNIVERSITY FIRST YEAR...

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