Draw the complete diagram of the circuit that uses a potential divider, ammeter, voltmeter and cell to measure the current-voltage characteristics for component X.

The graph shows the current-voltage characteristics for the component X.

Component X is now connected across the terminals of a cell of emf 2.0 V and negligible internal resistance. Use the graph to show that the resistance of X is \({\text{0.83 }}\Omega \).

voltmeter in parallel across X;

ammeter in series with X;

correct circuit; (allow ecf from 1st and 2nd marking points)

Accept voltmeter connections that include ammeter (in series with X)

Condone re-drawing of resistor X closer to variable resistor.

\(I = 2.4{\text{ A}}\) at 2.0 V;

\(\frac{2}{{2.4}}\);

\( = 0.83{\text{ }}\Omega \)

Award [1 max] for use of gradient of graph from (2,2.4) to origin.

Circuit diagrams of the potential divider were very poor although most were able to predict the correct positions for the ammeter and voltmeter.

Most candidates achieved full marks here.