There is resistance: but the resistance of a diode depends on the direction of the applied pd.TyErd said:
Why do you say that if no current flows there is no resistance?
There will be some resistance, but how does this compare with the resistance in reverse bias?
Stonebridge said:
The V-I characteristics of a diode refer to the relationship between the voltage applied across the diode and the resulting current flow through it. This is important to study because it helps us understand how the diode behaves under different bias conditions and how it can be used in electronic circuits.
In forward bias, the diode is connected in such a way that the positive terminal of the voltage source is connected to the anode (positive end) of the diode, and the negative terminal of the voltage source is connected to the cathode (negative end) of the diode. This allows current to flow through the diode. In reverse bias, the polarity of the voltage source is reversed, causing very little to no current to flow through the diode.
In a forward-biased diode, the V-I curve shows a gradual increase in current as the voltage increases. Once a certain threshold voltage is reached, the current increases rapidly. In a reverse-biased diode, the V-I curve shows very little current flow until a certain breakdown voltage is reached, after which the current increases rapidly.
Once the threshold voltage is reached in a forward-biased diode, the majority carriers (electrons in an N-type semiconductor or holes in a P-type semiconductor) are able to overcome the potential barrier at the junction and start to flow through the diode, resulting in a rapid increase in current.
The reverse breakdown voltage is the voltage at which the diode experiences a sudden increase in current flow in the reverse direction. This is an important parameter to consider when designing electronic circuits, as exceeding this voltage can damage the diode and affect the circuit's functionality.
