CAPE Physics Unit 2 · 2004 · Paper 1 · Question 4(b)(iii)

A potential divider circuit shown in Figure 4 consists of an LDR and a 10.0 kΩ fixed resistor connected in series across a 12.0 V supply. The potential at point X is 0.40 V in the dark and 4.2 V when light falls on the LDR.

Give ONE practical use for the circuit in Figure 4.

This question uses a figure or table from the paper — you'll see it when you practise.