2. Diodes Flashcards
A diode is the simplest possible semiconductor device. A diode ___________
Allows current to flow in one direction but not another and is a one way street fro electrons
A rectifier diode is the equivalent of ______
A one way valve
When conducting, the diode is said to be ______
Forward biased
When opposing current flow, the diode is said to be _______
Reverse biased
I’m every symbol the arrow indicates ______
The direction of current flow
The first letter is for semiconductor material
A is for Germanium
B is for silicon
The second symbol is for the use
A is for signal diode
Y is for rectifier diode
Z is for zener diode
Most semi conductors are made from ______
Silicon or germanium
P type material is known as the _____ and N type is known as the ______
- Anode
- Cathode
A diode is said to be
‘Biased’
An external voltage applied so that anode is positive and the cathode negative is called _____
Forward bias
If the voltage is applied so that the anode is negative with respect to the cathode the diode is ______
Reverse biased
Germanium diodes require a voltage of approximately _______
0.1 to 0.3 bolts
Silicon diodes require _______
0.6 to 0.7 volts
Forward voltage drop
Ideally a diode should have zero resistance when conducting and should cause no _______ , unfortunately this does not happen. germanium diodes crate a voltage drop of approximately ________ and silicon diodes a drop of approximately
- Voltage drop
- 0.6 V
- 1.1 V
Reverse leakage current
When a diode is reverse biased it should ideally have ___________ and no current should flow. unfortunately, when a diode is reverse biased a small current called _________ flows, generally this is too small to be of significance however it should be noted that the value of this increases with an increase in ______
- Infinite resistance
- Reverse leakage current
- Diode temperature
