2.10 describe how current varies with voltage in wires, resistors, metal filament lamps and diodes, and how this can be investigated experimentally

Resistors (e.g lamps and diodes) lessen the flow of current, whilst voltage increases the current. This can be investigated using an ammeter (measures current) and a voltmeter (measures voltage).

Set up a circuit like this (known as the 'standard test circuit')...

Interchange the component with different resistors for example a lamp or diode, and record the recordings on the ammeter.

Also, increase/decrease the voltage and note the change on the ammeter.

Compare and contrast results. Overall, increasing the voltage should increase the number on the ammeter (current) whilst resistors (the components) will lower the current.