Figure 1: Closeup of a diode, showing the square shaped semiconductor crystal (black object on left)
Figure 2: Various semiconductor diodes. Bottom: A bridge rectifier
. In most diodes, a white or black painted band identifies the cathode
terminal, that is, the terminal that conventional current
flows out of when the diode is conducting.
Figure 3: Structure of a vacuum tube
diode. The filament may be bare, or more commonly (as shown here), embedded within and insulated from an enclosing cathode
डायोड (En:diode) दुई ओटा टर्मिनल भएको इलोक्ट्रोनिक्स कम्पोनेन्ट हो ।