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Physics for Scientists and Engineers (3rd Edition)

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Experiment 4 Experiment 4. Current-Voltage Relationships and Resistance. In this experiment you will measure electric current as a function of voltage for two different resistors and for a light bulb. You will also measure the voltage and current for the two resistors connected in series and in parallel. A current vs. voltage plot is called the I-V characteristic of the device. Ohm's Law is satisfied when the I-V characteristic is a straight line. The resistance R defined as the ratio of applied voltage V to the resulting current I , R = V / I (Ohm's Law), where V is expressed in Volts, the current in Amperes, and the unit for R is the Ohm ( ). Equipment Power supply, Circuit board, Voltmeter, Amper meter. Method The voltage across each device to be studied is varied by changing the output of a power supply (see Figure). Voltages and corresponding currents are measured by meters. CAUTION: Check your circuit to make sure it is correctly wired. Set your meters to their least sensitive (
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4. Ohm's law - Experiment 4 Experiment 4 Current-Voltage...

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