Ammeter vs Voltmeter: Error Comparison

[lexylouloo]

Which one contributes more error when performing a lab calculating the voltage and current through different ohms of resistance? One was in parallel, the others in series and the last one both in series and parallel.
They are systematic errors, but not sure which one would contribute more error?
thanks :) really confused on this circuit stuff

 

[Gordianus]

It's almost impossible to give an answer without knowing some numbers.
What's the voltmeter's impedance?
What's the ammeter's impedance?
Do you know something about the value of R?

These numbers let us decide whether to use the "short" or "long" connections to minimize instruments' influence

 

[Chandra Prayaga]

Circuit diagrams are always the better way to convey such questions.