A light-monitoring circuit in a greenhouse contains an LDR and a fixed resistor of resistance 1.0 kΩ1.0\ \text{k}\Omega1.0 kΩ connected in series across a 9.0 V supply. The potential difference of the supply stays the same as the light level changes.
The resistance of the LDR is measured at two different light levels. One reading is 2.0 kΩ2.0\ \text{k}\Omega2.0 kΩ and the other is 8.0 kΩ8.0\ \text{k}\Omega8.0 kΩ.
The greenhouse changes from bright sunlight to dim light.
Calculate the change in the current in the circuit. State whether the current increases or decreases.
82 exam-style questions on AQA GCSE Physics 2.1 Current, potential difference and resistance, covering 2.1.1 Standard circuit diagram symbols, 2.1.2 Electrical charge and current, 2.1.3 Current, resistance and potential difference, and 2.1.4 Resistors. Each one has a worked solution and a mark scheme showing where the marks go.