Warming up on Currents

This assignment is due before 9 AM, Monday, October 9nd, 2000.

Please type LAST name:

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The following three questions refer to the material you were to read in preparation to the lesson. Questions one and two require you to write a three or four sentence response. Number three is a multiple choice question. Click in the appropriate circle.

You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT HOMEWORK button at the bottom of this page.

WarmUp questions are worth 5 points each towards your "Homework and Web Assignments" score (250 points total).




1.


For current flowing in a solid conductor the units of J (current density) are A/m2 (amps per square meter). Please explain why It is not A/m3. If current flows in the plane of a large thin conducting sheet, can we talk about a surface current density? What would the appropriate units be now?





2.

Estimate the resistance of a typical lightbulb.





3.

When current passes through a resistor it

Increases

Decreases

Stays the same

Any of the above, depending on the circuit.

Below is a space for your thoughts, including general comments about today's assignment. What was hard or confusing (or cool)? What would you like to spend extra time on in class? Do you see how this subject fits in with the others we have discussed?




You may change your mind as often as you wish. When you are satisfied with your responses click the SUBMIT button.

I received no help from anyone on this assignment.



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