# Current, Power, and Energy problem

1. Oct 21, 2005

Okay, here's the problem:
http://www.ihostphotos.com/show.php?id=174911" [Broken]

Already did it once, but then I realized my "method" looked good, but wasn't correct. Is there two loops for this problem, to start, or what? I get the formulas and the laws, but something is throwing me as to starting it.

Last edited by a moderator: May 2, 2017
2. Oct 21, 2005

Okay, now this one is the RIGHT thread

Last edited: Oct 21, 2005
3. Oct 22, 2005

Anybody???

4. Oct 22, 2005

### Pyrrhus

Use Kirchoff Rules.

5. Oct 22, 2005

Okay, did that. Only problem was when I got to b) and c), since the power I calculated as being deilvered by the 12-V battery seems WAY too big (132W).

Take a look:
Part a)
http://www.ihostphotos.com/show.php?id=175479" [Broken]

And then Parts b) and c) (where I may have slipped up):
http://www.ihostphotos.com/show.php?id=175481" [Broken]

Last edited by a moderator: May 2, 2017
6. Oct 22, 2005

Is it right???

7. Oct 22, 2005

ANYBODY think it looks correct? I'm confident on the first part, but just wondering about my answers to parts b) and c).

8. Oct 22, 2005

### Pyrrhus

Yes, i see no problem with it.

9. Oct 22, 2005

Okay, thanks!

10. Oct 23, 2005

### Andrew Mason

It is a little complicated to analyse this circuit but your answer cannot be right. Without R1 the current through the ammeter would be 5 amps. With R1 the current will be less.

AM

11. Oct 23, 2005