Physics (AS & A Level) · Oct / Nov 2019 · Paper 13 · Question 35

A box containing two electrical components is connected into a circuit. The variable resistor is adjusted and measurements are taken to determine the I–V characteristic for the box, as shown. Which arrangement of two electrical components in the box would create the best fit to the measured I–V characteristic?

1. Aa filament lamp and a fixed resistor in parallel
2. Ba filament lamp and a fixed resistor in series
3. Ca semiconductor diode and a filament lamp in parallel
4. Da semiconductor diode and a filament lamp in series

As printed in the paper