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.