A greenhouse temperature sensor has a thermistor and a fixed resistor in series, powered by a battery whose potential difference stays constant. A voltmeter across the fixed resistor reads less at dawn than it did the previous evening. Which statement explains the lower reading?
The greenhouse is warmer, so the thermistor's resistance is lower and the current is larger
The greenhouse is colder, so the thermistor's resistance is lower and the current is larger
The greenhouse is colder, so the thermistor's resistance is higher and the current is smaller
The greenhouse is warmer, so the thermistor's resistance is higher and the current is smaller
94 exam-style questions on AQA GCSE Physics 2.2 Series and parallel circuits, covering 2.2 Series and parallel circuits. Each one has a worked solution and a mark scheme showing where the marks go.