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Unformatted text preview: The human mind treats a new idea the way the body treats a strange protein -- it rejects it.-- P. Medawar Birzeit University Physics Department Physics 112 Experiment No.3 NETWORK ANALYSIS I THE SUPERPOSITION PRINCIPLE AND KIRCHHOTFS LAWS Students Name: Ammar T. Ammar Students No.: 1040385 Section: 7 Date: 10/3/2005 Instructor: Dr. Ziyad Izzat 2005 Copy left reversed Abstract: The aim of the experiment: is to verify the Superposition Principle and Kirchhoffs laws. And prove them experimentally. The method used: by comparing the value of the current passing each resistant measured using the ammeter with values we calculate using the mentioned laws. And doing the same with the voltages. Main results: I 1, I 2 , and I 3 were found to be 3.16mA, 1.29 mA and 1.87mA respectively and V 1 , V 2 , V 3 was found to be 3.20 V, 2.80V and 8.76V respectively. Theory: Electric networks are circuits that include many elements such as resistors, voltage sources and current sources that are connected together in a rather complicated way. In such cases, applying Ohm's law and the simple parallel and series connection rules is of no practical help. Many circuit analysis techniques where developed in order to facilitate analyzing complicated networks. Kirchhoffs laws and the superposition principle are such powerful techniques deduced from nature's most fundamental laws. 1 Kirchhoffs Laws 1) Loop theorem: This theorem is just the principle of conservation of energy as applied to electric circuits. It states that: The algebraic sum of the voltage drops and electromotive forces (emfs) in a closed electric circuit is always zero . In other words, the power 1 Namely the conservation of charge and energy laws. generated by sources in a closed circuit is totally consumed by the...
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