lab stuff

A - Draft due Friday

E - Draft due Monday

Final lab will be due the class after the draft is due.

Lab Questions for "Ohm's Law" lab - please change the title.  If you use "shocking" as part of your title, I'll deduct a point for lazy punning.

So far, you've done 2 graphs: I vs. R, V vs. R. They will be included in the lab. Don't forget titles, units, etc.

Lab questions

1. Examine the 2 graphs. Do they make sense? Why? What's going on in them? Do they appear to obey any mathematical relationship/equation?   Is one graph stranger (or more unexpected) than the other?  Discuss.

2.  Calculate experimental resistances for each pair of V and I - use the equation R = V/I

3. You've just determined experimental resistances for each trial. Are they within 1% (the supposed tolerance) of the expected/theoretical values (the ones on the box)? Should they be? If not, why are they not so good?  Don't forget sources of error, in general.

4. What does it mean exactly if something follows Ohm's Law? Do all electrical devices follow this law? Are there substances that definitely are not "ohm-ic"?

5. Other than the batteries "dying," what might happen as the batteries are connected to the resistors? Would the V and I values change?  Discuss.

6. What is meant by "internal resistance" of the battery, and how does it affect this experiment (your results)?

7. Anything else you want to conclude or talk about.

8.  Hooray!