SOLUTION

• A PN-junction diode can be formed using either germanium or silicon crystal.
• The PN-junction diode has two terminals, called the anode (A) and cathode (K).
• The P-type region of a PN-junction is called the anode and the N-type region is called the cathode.
• The figure represents the circuit symbol of a PN-junction diode. When the diode is forward biased, the current flows from anode to cathode.