Describe the current/PD characteristics of a diode practical

The circuit for the current/PD characteristics of a diode has the same components as the circuit for the resistor, however there is an extra resistor because diodes are very easily damaged by high current so the extra resistor keeps the current low to protect the diode. As the current will be low, an extra sensitive ammeter is needed: a milliammeter. Now adjust the variable resistor a number of times while recording the potential difference and the current, with the battery in the forward and reverse direction. Now plot a graph of the current against the potential difference, in the case of a diode, there is only a current when the potential difference is around 06-0.7 volts and as the potential difference increases beyond this point the current rises sharply. Moreover, with a diode there is no current when the potential difference is reversed because in the reverse direction a diode has a high resistance