A test circuit uses a uniform constantan wire as a current-limiting component. With a 30 cm section connected, the current is 0.90 A. The wire is at constant temperature, and its cross-sectional area and the potential difference across it are kept unchanged. The circuit is then rebuilt using a 45 cm section of the same wire.
What current should be expected with the 45 cm section connected?
0.40 A
0.90 A
0.60 A
1.35 A
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.