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Zorluk: KolayDiodes

A technician installs a standard semiconductor diode in series with a direct current (DC) motor circuit to provide reverse polarity protection. Which of the following best describes the operating characteristic of the diode that enables this protection?

  1. A
    It converts direct current into alternating current whenever a reverse voltage is applied.
  2. It allows current to flow easily in only one direction while blocking current flow in the reverse direction.Cevap
  3. C
    It permits current to conduct freely only when the cathode is held at a higher positive voltage than the anode.
  4. D
    It increases circuit voltage to force conventional current to flow from the negative terminal to the positive terminal.

Cevap

The diode allows current to flow easily in only one direction while blocking current flow in the reverse direction.
A semiconductor diode functions as an electrical one-way check valve. When forward-biased (anode more positive than cathode), it allows current to pass with minimal resistance. When reverse-biased (voltage polarity reversed), the diode exhibits extremely high resistance and blocks current, safeguarding downstream components from incorrect power connections.

Adım Adım Çözüm

1
Identify the primary electrical function of a semiconductor diode
A diode is designed to allow electric current to pass easily in one direction (forward bias) while presenting very high resistance to current flowing in the opposite direction (reverse bias).
Understanding the fundamental one-way conduction property explains how it functions as a circuit safeguard.
2
Apply the diode characteristic to the reverse polarity protection scenario
When power is connected with normal polarity, the diode is forward-biased and allows normal circuit operation. If the battery is connected backward, the diode becomes reverse-biased and blocks the reverse current, preventing component damage.
This directly demonstrates why unidirectional conductivity provides reverse polarity protection.

Anahtar Kavram

Unidirectional current flow and biasing in semiconductor diodes
Tahmini Süre:45s
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