A student connects a diode, an ammeter and a variable resistor in a single loop with a power supply. As the potential difference is increased from 0 V to 5 V the ammeter reads 0.00 A for every value.
Explain why the ammeter reads 0.00 A for all of these values of potential difference.
Describe the change the student should make so that the ammeter reads a current.
Give the property of a diode that this investigation demonstrates.
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.