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127-04 Ohm's Law-1
Course: PHY PHY126, Spring 2009School: SUNY Stony Brook
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127 PHYSICS EXPERIMENT NO. 4 CURRENT-VOLTAGE RELATIONSHIPS AND RESISTANCE In this experiment, the current-voltage characteristics of three electrical devices (a radio resistor, a light bulb filament, and a silicon diode) are measured. A. Equipment 1 Power Supply, 1 Device Circuit Board, 1 Voltmeter, 1 Ammeter. B. Method The voltage across each device to be studied is varied by changing the output of a power supply...
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127 PHYSICS EXPERIMENT NO. 4 CURRENT-VOLTAGE RELATIONSHIPS AND RESISTANCE
In this experiment, the current-voltage characteristics of three electrical devices (a radio resistor, a light bulb filament, and a silicon diode) are measured. A. Equipment 1 Power Supply, 1 Device Circuit Board, 1 Voltmeter, 1 Ammeter. B. Method The voltage across each device to be studied is varied by changing the output of a power supply (see Figure 1). Voltages and corresponding currents are measured by meters. A current vs. voltage plot is called the I-V Characteristic of the device. Such a plot yields much useful information.
Ammeter + Power Supply + + Voltmeter Device
Figure 1. I-V Measurement.
C. Procedure I. I-V Characteristics 1. Connect the circuit as shown in Figure 1 with a resistor as the device under test. CAUTION: Check your circuit to make sure it is correctly wired and set your meters to their least sensitive (i.e. highest number) scales before you turn on the power supply. Your meters should read zero when no voltage is applied to the If device. they do not, follow the zeroing procedure discussed by your T.A.
Measure the current read by the ammeter for at least 5 values of voltage between 0 and 10 Volts. Reverse the polarity of the power supply and the meters and repeat these measurements for negative voltages and currents.
Q1. The voltmeter reads the voltage across the device, but the ammeter reads the current through the device plus the current through the voltmeter. Is this an important effect? How can you check? Q2. Plot current as a function of voltage for the resistor, showing experimental error bars on each point. Q3. Determine the resistance of the resistor from your plot.
2. Repeat these measurements with the light bulb in place of the resistor. DO NOT EXCEED THE RATED VOLTAGE OF THE BULB.
Q4. Plot the I-V Characteristic. Q5. Does the light bulb obey Ohm's Law? Q6. Can you explain the bulb's behavior?
3. Repeat the measurements for the silicon diode.
Q7. Plot the I-V characteristic. Q8. What useful application can you think of for the diode?
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