Electricity and Magnetism

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Connecting an Ammeter in Circuit


You wish to measure the current in the DC circuit shown below; your lab mate connects the ammeter as shown below.

Created for Albert.io. Copyright 2016. All rights reserved.

Which of the following is the BEST explanation of what will happen when the switch $S$ is closed?


Nothing will happen; the ammeter is in series with the circuit. For current to be measured, the ammeter must be in parallel with the circuit.


The arrow on the meter will move to the right, ​and the arrow will point to the current in the circuit, as desired.


The arrow on the ammeter will move to the left causing the ammeter to read "negative" current​.


The ammeter is not connected properly, and it will not measure current but instead​ the voltage drop between the two resistors.