# Experiment2 - B irzeit University Physics Department...

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Birzeit University Physics Department Physics 112 Experiment No.2 Linear and non-linear Circuit Components Student’s Name: Ammar T. Ammar Student’s No.: 1040385 Partner’s Name: Bashar Al-Masoud Partner’s No.: 1030114 Section: 7

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Date: 3/3/2005 Instructor: Dr. Ziyad Izzat 2005 copy left reserved Abstract: The aim of the experiment: is to measure the internal resistance of a voltage source, the potential difference, and see when does the power reach its maximum value. The method used: The direct calculation of the electrical current passing through a simple circuit at different values of the resistance. Main results: = 259 in r v 05 . 10 = ε Theory: One of the main characteristics of a voltage source is the electro motive force (emf), which is the open circuit voltage difference between its terminals, as shown in (figure 1a), and the maximum value of the current deliver to a short circuit. And according to Ohm’s law; an ideal voltage source connected to a short circuit ( 0 = in r ) 1 should be able to provide an almost infinite current. However, In real circuits a voltage source connected to a short circuit can neither maintain its (emf) as a voltage difference across its terminals nor can it provide the circuit with unlimited current. It should be obvious that voltage sources with small internal resistances can maintain most of their 1 in r stands for the internal resistance of the voltage source.
(emf) as voltage differences between their terminals and provide circuits with higher current values than would the ones with high internal resistances. Voltage sources are used to provide useful electrical power to certain circuit components, such as electric motors and light bulbs. Any component which consumes electrical power to produce useful work is called a load and the resistance of such a component is called the load resistance, and is referred to by ( L R ).

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Experiment2 - B irzeit University Physics Department...

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