A student sets up a circuit to investigate how the current in different components
varies with voltage.
He investigates these components.
● a short thick copper wire
● a filament lamp
● a long thin copper wire
● a diode
State four other pieces of equipment the student needs.
During the investigation, the student keeps the two copper wires at a
Give a reason why he should keep the wires at a constant temperature.
Describe how he could keep the wires at a constant temperature.
The student obtains a graph for each component.
Draw a straight line linking each component to its correct graph.