Circuit problem answers

Once again, I send my sincere apologies for missing class last night.  With a tree and downed power lines trapping my car onto a parking lot (accessible by only one road), I had no choice but to wait it out.  As I told one particularly upset student, it was not frivolous - as it was not when I was sick (and without voice) a few weeks ago.  Please feel free to chat with me if you have other concerns.

We'll spend the next two classes discussing magnetism, electromagnetism and electromagnetic induction.

I mentioned the forming of a study group.  To date, I have only heard from one student.

Circuit problem answers:

1.  See notes for the distinction.

2.  Voltage (in volts, V), current (in amperes, A), resistance (in ohms, W), power (in watts)

3. V = I R (though it only applies to "ohm-ic" devices, not to things like thermistors, for example).

4. 4.5 A

5. Series - constant current, voltages split.  Parallel - constant voltages, current splits.  Recall demonstrations from class.

6. A complete path for charge to travel, generally from a positive side of a voltage source to its negative side.

7. brightness goes down

8. Remains the same.

9. Parallel brighter

10. See notes.

11. Series

12. Water analogy is ok

13. Series - bulbs go out.  Parallel - bulbs remain lit.