Elect Systems 100 Lab Report 2.doc - ELECTRICAL SYSTEMS 100...

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ELECTRICAL SYSTEMS 100 STUDENT NUMBER: 17098128 NAME: CALVIN CHIN GROUP: LABORATORY: Expt No. 2 DC CURCUITS LABORATORY SUPERVISOR: LABORATORY PARTNERS: DATE PERFORMED: 26 th March 2014 DATE DUE: 9 th April 2014 DATE SUBMITTED: 9 th April 2014 I hereby declare that the calculation, results, discussion and conclusions submitted in this report is entirely my own work and have not copied from any other student or past student. Student Signature: ________________________________________
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1.0 INTRODUCTON The purpose of the lab session was to analyse the circuit and network system in DC current using a range of analysis techniques. The current, voltage and power through the current and resistors obtained using the following concepts: -Series circuit -Parallel circuit -Thevenin’s Theorem -Maximum Power Transfer -Nodal Analysis -Mesh Analysis All measurements were taken on a Fluke 175 DMM to verify the calculated results. 2.0 SUMMARY OF RESULTS The graph of Thevenin’s equivalent circuit shows a parabolic relationship between load power and normalised resistance. Also the measured load powers of the resistors were almost similar to the calculated load power and the highest percentage difference being 3.13% for the Thevenin’s equivalent circuit. For Mesh Analysis, the highest percentage difference was 4.00%, which is still relatively small and thus does not detract reliability or accuracy from the overall results.. In nodal analysis, when calculating V R1 - V R5 it became clear that the wrong number was subtracted from the wrong number (e.g. we used x-y instead of y-x) and as a result, had the negatives and positives completely opposite from the results.
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3.0 CIRCUITS Figure 1.1 Figure 1.2 Figure 1.3
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4.0 RESULTS 4.1 THEVENIN’S EQUIVALENT CIRCUIT Resistor R 1 : 150 Ω Resistor R 2 : 120 Ω Resistor R 3 : 180 Ω Resistor R 4 : 18 Ω Resistor R 5 : 10 Ω Resistor R Th : 100 Ω E TH : 10.8 V Refer to figure 1.1 and 1.2 Thevenin’s Equivalent Circuit Results Load Resistance (Ω) Measured Calculated Normali sed Resistan ce Original Network Thevenin’s Equivalent Theoretical Results Voltag e (V) Curren t (mA) Power (W) Voltag e (V) Curren t (mA) Powe r (W) Voltag
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