What does the VI curve for a diode show?

The I-V or V-I curve (current to voltage or voltage to current characteristic curve) graphically shows the relationship between the voltage across an electrical or electronic device and the current flowing through it. It helps us understand how an electrical or electronic device operates.

What is a VI curve?

A linear VI curve has a constant slope and hence a constant resistance. This means that the V-I curve is a straight line passing through the origin. An electronic component may exhibit linear characteristics only in a particular region. For example, a diode has a mostly linear behavior in its operating region.

What is the characteristic curve of a diode?

A typical characteristic curve for a diode is shown in Figure 1. This curve shows the variation of the diode current versus the voltage across the diode. On the right-hand side of the vertical axis (the current axis), a diode is forward biased because the voltage applied across it is positive.

Why is a diode graph curved?

The diode continues to block current flow through it until the reverse voltage across the diode becomes greater than its breakdown voltage point resulting in a sudden increase in reverse current producing a fairly straight line downward curve as the voltage losses control.

Why do we use Zener diode?

The Zener voltage across a diode remains constant over a wide range of Zener current. A Zener diode permits Zener current, Iz, to flow when the voltage is above the specified Zener voltage. Thus, a Zener diode can be used for voltage detection by sensing Zener current with some other device.

What is the difference between Vi graph and IV graph?

In VI graph, we take potential at y-axis and current at x-axis. The slope of VI graph give us the resistance. In IV graph, Current is at y-axis and potential is at x-axis. The reciprocal of the slope of IV graph shows the resistance.

How do you explain an I-V curve?

An I-V curve (short for ‘current-voltage characteristic curve’), is a graphical representation of the relationship between the voltage applied across an electrical device and the current flowing through it. It is one of the most common methods of determining how an electrical device functions in a circuit.

What is Zener diode VI characteristics?

Zener Diode is a reverse-biased heavily-doped PN junction diode which operates in the breakdown region. The reverse breakdown of a PN- junction may occur either due to Zener effect or avalanche effect. Zener effect dominates at reverse voltages less than 5 volt whereas avalanche effect dominates above 5 V.

Do diodes reduce voltage?

Diodes allow electricity to flow in only one direction, but a diode will only conduct electricity, when the supply reaches its threshold. The threshold for common silicon diodes is 0.6 volts. After each diode, the voltage can be seen to drop by 0.6 volts. In this way, diodes can be used to reduce voltage, in a circuit.

What is the difference between the VI characteristics curve of a Zener diode and normal PN junction diode?

The major difference between PN junction and the Zener diode is that the PN junction diode allows current to pass only in the forward direction, whereas the Zener diode allows the current to flow both in the forward and the reversed direction.

What do VI and R stand for in Ohm’s law?

V = voltage in volts (V) I = current in amps (A) R = resistance in ohms ( )

What is diode characteristic curve?

Breakdown voltage. : Voltage at which a semiconductor device changes behavior or gets damaged.

  • Breakdown point.
  • Avalanche current.
  • Peak inverse voltage (PIV): It is the maximum reverse bias voltage that a diode can withstand without getting damaged (breaking down).
  • Peak reverse voltage (PRV): The same as Peak Inverse Voltage (PIV).
  • What are the V-I characteristics of a diode?

    Volt-ampere (V-I) characteristics of a pn junction or semiconductor diode is the curve between voltage across the junction and the current through the circuit . Normally the voltage is taken along the x-axis and current along y-axis.

    What is the voltage of a diode?

    The normal diode may have a reverse-breakdown voltage of around 160 volts (V), and this voltage is the common peak level of a 110 volts alternating current (VAC) power line voltage.

    What are the I-V characteristics of a Zener diode?


  • Md.Mujahiduzzaman
  • Zener diodes are a special kind of diode which permits current to flow in the forward direction.
  • but it also permits current to flow in the reverse direction
  • The term regulator means which regulates or controls.