Q: What is the primary function of a diode in electronic circuits?

A To amplify signals
B To allow current to flow in one direction only
C To store electrical charge
D To convert AC to DC

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Answer: B

Explanation:

A diode is a semiconductor device that permits current flow in only one direction, acting as a one-way valve for electrical current. This characteristic is essential for rectifying AC to DC, protecting circuits from reverse voltage, and signal demodulation in communication systems. The diode's ability to block current in the reverse direction is due to its PN junction, where the P-type and N-type materials create a depletion region that prevents reverse current flow. When forward-biased, the depletion region narrows, allowing current to pass. This functionality makes diodes crucial components in power supplies, signal processing, and communication equipment.

Electronic Devices and Communication System

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Q: What is the primary function of a diode in electronic circuits?

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