Does an ammeter's internal resistance decrease the current in a circuit?

[lha08]

Homework Statement

I'm writing my sources of error for my lab report and I'm just wondering if its true that the ammeter has internal resistance in it, and that this will increase the resistance in the circuit, which will ultimately decrease the current in the circuit?? Does this sound right??

Homework Equations

The Attempt at a Solution

 

[ehild]

Yes.

ehild

 

[Borek]

Ideal ammeter has no internal resistance, ideal voltmeter has infinite internal resistance. Real ammeters and voltmeters are not ideal. In effect real ammeter always decreases the current (increasing circuit resistance), and real voltmeter always lowers the potential (drawing a current).