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Ohm’s Law



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Physics 204B Spring 06 California State University Chico Ohm s Law Goals Construct a qualitative understanding and quantitative relationship between voltage current and resistance in a single resistor circuit Equipment On student bench Laptop lab Pro interface current sensor differential voltage sensor dual channel amplifier DC power supply wires clips 10 ohm resistor 50 ohm resistor light bulb 6 3V lamp holder and multimeter Part I Mathematical relationship between voltage current and resistance in a single resistor circuit Experiment setup Connect the differential voltage sensor to channel 1 of the Lab Pro Connect the current sensor to probe 2 on the DCA and channel 2 on the DCA to channel 2 on the Lab Pro Connect the Lab Pro to the Laptop With the power supply turned off connect the current sensor and a 10 ohm resistor to the power supply using wires and clips to complete the circuit shown Make sure the red lead on the current sensor connects to the red lead on the power supply Then connect the red clip on the voltage sensor to the side of the resistor that is electrically closer to the red lead of the power supply and connect the black clip on the voltage sensor to the other side of the resistor Computer program Open Logger Pro 3 3 on the laptop Click Scan OK File Open Physics with Computers 25 Ohm s Law Click the Zero button to reset the sensors To use the Logger Pro software Click Collect to begin taking data Each time you click the Keep button a data point will be stored The voltage sensor will read the voltage across the resistor and the current sensor will measure the current through the resistor Activity 1 The goal of this experiment is to test Ohm s law To conduct a scientific testing experiment it s very crucial to make predictions first a Make your prediction Write down your prediction for this experiment Don t forget to apply the if then logical reasoning You may plot a graph to represent your prediction Copyright Xueli Zou 1 b Conduct the experiment



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