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127-04 Ohm's Law-1 - PHYSICS 127 EXPERIMENT NO 4...

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PHYSICS 127 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 + - Voltmeter + - Power Supply + - 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 device. If they do not, follow the zeroing
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