A student measures the resistance of a sample of wire. She plans to use the circuit shown in the figure below.
Two circuit symbols are incomplete.
Complete the symbols for the two meters on the figure.
The current in the wire is 
. The potential difference across the wire is 
. Calculate the resistance of the wire.
The student tests a thinner wire. It is the same length as the wire in (b) and is made of the same material. The potential difference across the wire is . Explain how the current in this thinner wire compares with that in the first wire.
.
