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What is Physics Good For?

Warming up on... Resistors

This assignment is due before 9 AM, Monday, September 17^th, 2007.

Please type your last name and first initial (e.g., Rader, A):

Please type a nickname: (in case your answer gets used in class).

The following questions refer to the material you were to read in preparation to the lesson. Please write a three or four sentence response to each of the questions.

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 4 points.

1.

In your own words, please explain what "resistivity" is. Explain where it comes from, and how it is related to "resistance."

2.

Estimate the resistance of a typical lightbulb.
Hint: you know what the power and voltage of a typical lightbulb are!

3.

When current passes through a resistor something decreases, but what? Is it the current (I)? The kinetic energy of the electrons? Their potential energy? Something else?

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.

This site is made possible by funding from the National Science Foundation (DUE-9981111).

This assignment is due before 9 AM, Monday, September 17th, 2007.

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This assignment is due before 9 AM, Monday, September 17^th, 2007.