Four components are drawn in one circuit diagram. Which component has a resistance that changes because of a change in its surroundings?
The circle with a cross drawn inside it, joined into the single loop
The plain rectangle with a diagonal arrow drawn through it at an angle
The rectangle inside a circle with two arrows pointing towards it
The solid triangle touching a line, with two arrows pointing away from it
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.