In Lab 5 (the transistor/motor lab), you used a “sufficiently high value” resistor (most teams used...
In Lab 5 (the transistor/motor lab), you used a “sufficiently high value” resistor (most teams used a 470 ohm resistor) between a digital pin on the Arduino and the base pin of the transistor. One team had a discussion about why that resistor was needed.
Student 1: You need that high of a resistor because the drift speed of the electrons is too high coming out of the Arduino, and the resistor slows that down enough to be usable at the transistor.
Student 2: No, you need that resistor because the potential energy of the electrons is too high coming out of the Arduino, and the resistor reduces that enough so the transistor doesn’t fry.
Student 3: No, you’re both wrong. The current coming out of the Arduino is too high without the resistor, so the resistor’s job is to reduce the number of electrons reaching the transistor’s base pin.
Which student’s reasoning, if any of them, is correct? You must explain also why the other two students’ reasoning is not correct. If you think all of them are wrong, explain why each statement is false, and supply the correct reason.
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In Lab 5 (the transistor/motor lab), you used a “sufficiently
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