Experiment 2 Ohm's Law

Physics

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Experiment 2: Ohm’s Law Christian Lawrence Yasmine Hill Pritesh Patel NehaManikonda 1/29/10 Instructor: Sonal Singh
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Abstract: During the Ohm’s Law experiment, the objective is to understand the relationship between voltages and currents. Throughout this investigation we were able to study the behavior in both ohmic and nonohmic resistances. By setting up a circuit we were able to adjust voltages, currents, and resistances for three different investigations. In addition, we also measured an unknown and varied the voltage and current on it to verify the resistance. While varying the current with voltage for the first part of the experiment (TI), we changed the resistivity to 6000 ohms and 10,000 ohms to see different deviations. For the last part we kept the voltage constant in order to record the deviations of the current and resistance. From the investigation we found that the percent error is 50.4%. Introduction: Ohm’s law is commonly used to represent the relationship between the entities of voltage (V,) current (I,) and resistance (R.) Unlike other physics relationships such as Newton’s law of gravitation Ohm’s law is not pervasive for all materials. Materials can be classified as “ohmic’ if they demonstrate a constant resistance over a wide range of voltages. Plotting the voltage and current against each other for “ohmic” materials will yield a linear relationship while a nonlinear relationship is the norm for a lot of V against I for “nonohmic’ materials.“Nonohmic” materials are those that have changing resistance values over a variety of voltages. Electric circuits can be compared to liquid circuits; the rate of liquid flow is dependent upon the resistance to the flow of liquid which can be caused by obstructions in the circuit piping. In an electric circuit the voltage is provided by a battery source and this voltage allows for the flow of charge. For a given voltage in the circuit the current is dependent upon the resistance in that a greater resistance will result in a lower current and vice versa. When a circuit contains more than one resistor Ohm’s law can be applied
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Experiment 2 Ohm's Law - Experiment 2: Ohms Law Christian...

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