Understanding PN Junction Diodes

What happens to a PN junction diode when it is forward biased?

• The diode becomes an insulator.

• The diode generates voltage.

• The diode conducts current.

• The diode blocks current.

Explain the role of a Zener diode in voltage regulation.

• A Zener diode regulates voltage by clamping the output to a specific Zener voltage, maintaining a constant voltage despite changes in input or load.

• A Zener diode increases voltage by amplifying the input signal.

• A Zener diode acts as a switch to turn on and off the current flow.

• A Zener diode converts AC voltage to DC voltage for better efficiency.

How does a diode function as a rectifier in an AC circuit?

• A diode functions as a rectifier by allowing current to flow in one direction, converting AC to DC.

• A diode increases the voltage of AC signals before converting them to DC.

• A diode blocks all current, preventing any flow in an AC circuit.

• A diode allows current to flow in both directions, making it a conductor.

What is the effect of reverse bias on a PN junction diode?

• Reverse bias decreases the depletion region and allows current flow.

• Reverse bias increases current flow through the diode.

• Reverse bias increases the depletion region and prevents current flow in a PN junction diode.

• Reverse bias has no effect on the depletion region or current flow.

List two common applications of Zener diodes in electronic circuits.

• Signal amplification

• Rectification in power supplies

• Current limiting in LED circuits

• Voltage regulation and voltage reference