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PHY134_OhmsLaw

# PHY134_OhmsLaw - PHY134 Ohms Law PHY134 Classical Physics...

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PHY134 Ohms Law PHY134 - Classical Physics II Laboratory Ohm's Law 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 is defined as the ratio of the applied voltage V and the resulting current I : R = V / I (Ohm's Law), (1) where V is expressed in Volts (V), the current in Amperes (A), and the unit for R is the Ohm ( =V/A). Equipment Power supply, Circuit board, Voltmeter, Ampere 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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PHY134_OhmsLaw - PHY134 Ohms Law PHY134 Classical Physics...

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