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What happens to a diode when it is reverse-biased?

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Question: What happens to a diode when it is reverse-biased?

Options:

  1. It conducts current freely
  2. It blocks current flow
  3. It generates heat
  4. It amplifies the signal

Correct Answer: It blocks current flow

Solution: 

When a diode is reverse-biased, it blocks current flow, preventing it from conducting until the breakdown voltage is reached.

What happens to a diode when it is reverse-biased?

Practice Questions

Q1
What happens to a diode when it is reverse-biased?
  1. It conducts current freely
  2. It blocks current flow
  3. It generates heat
  4. It amplifies the signal

Questions & Step-by-Step Solutions

What happens to a diode when it is reverse-biased?
  • Step 1: Understand what a diode is. A diode is a component that allows current to flow in one direction only.
  • Step 2: Learn about biasing. Biasing refers to how we connect the diode in a circuit.
  • Step 3: Know what reverse-bias means. Reverse-bias occurs when the positive side of the voltage source is connected to the negative side of the diode.
  • Step 4: When a diode is reverse-biased, it creates a barrier that prevents current from flowing through it.
  • Step 5: This blocking continues until a certain voltage, called the breakdown voltage, is reached.
  • Step 6: If the breakdown voltage is reached, the diode may start to conduct, but this can damage the diode if it is not designed for it.
  • Reverse Biasing – In reverse bias, the diode's anode is connected to a lower potential than the cathode, which prevents current flow.
  • Breakdown Voltage – The voltage at which the diode begins to conduct in reverse bias, potentially leading to damage if exceeded.
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