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Difficulty: EasyDiodes

In an electronic power supply circuit, what is the primary function of a rectifier diode?

  1. A
    To maintain a constant opposition to electric current regardless of circuit voltage polarity
  2. To convert alternating current (AC) into direct current (DC) by allowing current to flow in only one directionAnswer
  3. C
    To store electrical charge in an electrostatic field to filter out voltage variations
  4. D
    To step up or step down alternating voltage levels through electromagnetic induction

Answer

To convert alternating current (AC) into direct current (DC) by allowing current to flow in only one direction
A semiconductor diode permits electrical current to flow easily in only one direction (when forward-biased) and blocks current flow in the reverse direction (when reverse-biased). In power supply circuits, this unidirectional property is utilized in rectification to convert alternating current (AC) into direct current (DC).

Step-by-Step Solution

1
Identify the fundamental operational characteristic of a semiconductor diode.
A diode acts as a one-way electrical valve, exhibiting very low resistance in the forward direction and extremely high resistance in the reverse direction.
Understanding the unidirectional conduction property of the PN junction is essential for determining its circuit application.
2
Connect this one-way conduction property to its purpose in a power supply circuit.
When alternating current (AC) is applied, the diode conducts only during the positive half-cycles, producing a pulsating direct current (DC) output.
Rectification is the process of converting bidirectional AC into unidirectional DC.

Key Concept

Unidirectional current conduction and AC-to-DC rectification by semiconductor diodes
Estimated Time:45s
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Diodes

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