A student uses the circuit at right in order to measure IV characteristic curves
ID: 2147712 • Letter: A
Question
A student uses the circuit at right in order to measure IV characteristic curves for three unknown devices (Devices 1-3). The graphs are shown below. The student has been told that each unknown device is one of the five devices shown below. The IV characteristic curve for Device 1 is best accounted for if Device 1 is A, B, C, D, or E The IV characteristic curve for Device 2 is best accounted for if Device 2 is or The IV characteristic curve for Device 3 is best accounted for if Device 3 is a, B, C, D, or E ?? Which of the following best represents the resistance of Device 2? 0-005, or 0.05, or 0.2, or 5, or 20, or 200. or "The resistence of device 2 is not constant (device 2 is non-ohmic)"Explanation / Answer
Device 1 is most likely to be B, since heating of the filament bends the curve towards the V-axis. Device 2 is represented best by A. Device 3 is best represented by E, since current in both directions is possible beyond a certain voltage (1 V). Device 2 has constant resistance - (2 V / 10 mA) = 2/0.01 ohm = 200 ohm.
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