Current, Power, and Energy problem

[caddyguy109]

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

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.

 

[caddyguy109]

Okay, now this one is the RIGHT thread

 

[caddyguy109]

Anybody?

 

[Pyrrhus]

Use Kirchoff Rules.

 

[caddyguy109]

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"

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

 

[caddyguy109]

Is it right?

 

[caddyguy109]

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

 

[Pyrrhus]

Yes, i see no problem with it.

 

[caddyguy109]

Okay, thanks!

 

[Andrew Mason]

Is it right?

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

 

[caddyguy109]

Hmm...then what should I do differently?