VI Characteristics for Diodes: Investigation and Analysis

In this video, Matt demonstrates how to adapt a circuit to study the relationship between current and potential difference for a diode. He replaces a resistor with a diode and sets up the circuit with a power pack, ammeter, and voltmeter. Matt conducts an experiment by adjusting the potential difference and observes that current flows only when the potential difference is positive and above 0.3 volts. He plots the results on a graph, showing two distinct linear trends. The analysis reveals that the diode allows current to flow in one direction only, with varying resistance. The video concludes with a summary of the diode's characteristics.

What component did Matt replace the resistor with in the circuit?

• An inductor

• A diode

• A transformer

• A capacitor

What happens to the current when the potential difference is initially increased across the diode?

• The current decreases

• The current fluctuates

• The current immediately increases

• The current remains zero

What is the effect of reversing the potential difference on the current flow through the diode?

• The current fluctuates

• The current decreases

• The current increases

• The current remains zero

At what potential difference does the current start to flow through the diode?

• 0.3 volts

• 0.2 volts

• 0.1 volts

• 0.4 volts

What is the resistance of the diode when the potential difference is 0.6 volts and the current is 0.3 amps?

• 1.0 ohms

• 2.0 ohms

• 3.0 ohms

• 4.0 ohms

What conclusion can be drawn about the diode's resistance in the positive direction?

• It increases with increasing potential difference

• It decreases with increasing potential difference

• It is very high

• It is constant

What is the main characteristic of a diode as observed in the experiment?

• It allows current to flow in one direction only

• It allows current to flow in both directions

• It blocks current flow completely

• It has a constant resistance