Lab questions

Lab Questions for Ohm's Law lab

So far, you've done 2 graphs: I vs. R, V vs. R. They will be included in your 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 10% 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?

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

7. In part 2 of the experiment, you experimented with resistors in series and in parallel.  What can you generally summarize from resistors in series versus being in parallel?

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

9.  Hooray!