Ammeter Connections for Battery Current Measurement

[HeLLz aNgeL]

Homework Statement

In which diagram(s) (labeled A - D) does the ammeter correctly measure the current through the battery?

The Attempt at a Solution

I know that ammeters measure the current in series, and that the voltmeter won't have any effect on its reading, but I'm confused about the digram A

I would say that its image A and D, but I'm not sure how A would work

any help would be appreciated guys !

 

[HeLLz aNgeL]

anyone ?

 

[rock.freak667]

Attachments take a while to be approved, upload it on imageshack and then upload the link here

 

[HeLLz aNgeL]

my bad, here it is:

http://session.masteringphysics.com/problemAsset/1004655/20/187108B.jpg

 

[rock.freak667]

ok assuming that the voltmeter and ammeter are ideal. The voltmeter will have infinite resistance. What does that mean for a current passing through the voltmeter?

 

[HeLLz aNgeL]

ahhh, it'll go down to zero ...thanks !

one more thing, when will the voltmeter read zero ?


i'm thinking since it measures potential between two points it will be zero wherever there is a clear path between the two points: "D" ... sounds right ?