Physics 1215 Reading Questions
Assignment # 7

Chapter 19.0 - 19.14, 19.16

Reading Questions should be submitted electronically using this form. They are due by 8:00 a.m. on Tuesday, March 11, 2008.
Any Reading Questions arriving late will receive no credit.
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Answer the Reading Questions below. Please answer each question.

1. Describe the direction of the conventional current in a wire and the direction that electrons move in a wire.

2. What is resistivity and how is it related to resistance?

4. Is Ohm's law a fundamental law of physics? If not, under what circumstances can you use it?

4. In general, how does the resistance of a wire change as it gets hotter.

The resistance increases.
The resistance decreases.
The resistance stays the same.

5. When resistors are placed in series, what electrical quantity (e.g. voltage, current, resistance) is the same for the two resistors? What about when they are placed in parallel?

6. What fundamental law of physics is responsible for the "Kirchoff's Voltage Law" (also known as "Kirchoff's Loop Rule")?

7. Suppose there are two different paths to move from point A to point B in an electrical circuit. What can you say about the change in electric potential along the two paths? Explain your reasoning.

8. How does the terminal potential difference depend on the current flowing through the battery?

9. Suppose you have a complicated electric circuit with current flowing out of a battery through one wire, going through a number of resistors, then flowing into the battery through another wire. How does the current flowing out of the battery compare to the current flowing into the battery?

It is less.
It is the same.
It is more.
It is impossible to tell without analyzing the circuit.

10. What is the time constant for an RC circuit?

Final Question: (This question must be answered to receive any credit). What is one thing from the chapter that you didn't understand or need clarified?

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