Diode and P-N Junction

Play an AI-generated podcast conversation about this lesson

What is the primary function of a diode in an electronic circuit?

To amplify weak signals
To allow current to flow in one direction with greater ease (correct)
To filter out unwanted frequencies
To regulate voltage levels

In a p-n junction, what is the characteristic of the p-region?

No concentration of electrons or holes
High concentration of electrons and very few holes
High concentration of holes and very few electrons (correct)
Equal concentration of electrons and holes

What is the purpose of applying an external voltage to a p-n junction diode?

To generate a high-frequency signal
To increase the depletion layer's width
To create a short circuit
To decrease the depletion layer's width (correct)

What is the effect of forward biasing on the depletion layer?

It decreases the depletion layer's width (C) Signup and view all the answers

What is the term for the process of applying an external voltage to a p-n junction semiconductor diode?

Biasing (B) Signup and view all the answers

What is the central region in a p-n junction where positive and negative ions accumulate?

Depletion layer (D) Signup and view all the answers

What happens to the width of the PN junction diode when it is reverse-biased?

It grows wider due to a lack of electrons and holes. (A) Signup and view all the answers

What is the function of an LED?

To emit light when an electric current flows through it. (D) Signup and view all the answers

What is the result of increasing the width of the depletion layer in a reverse-biased diode?

A high potential barrier is created. (D) Signup and view all the answers

What is the analogy of a diode's behavior?

A hydraulic check valve. (C) Signup and view all the answers

What is the state of a diode when it is forward-biased?

Closed (C) Signup and view all the answers

What happens to the electrons in the N-type material when a diode is reverse-biased?

They are attracted towards the positive electrode. (C) Signup and view all the answers

Why is silicon widely used in normal p-n junction diodes?

Because it is less sensitive to temperature and allows electric current efficiently (B) Signup and view all the answers

What is the primary function of a current limiting series resistor in an LED circuit?

To control the current flowing through the LED (D) Signup and view all the answers

What happens when an LED is connected in reverse direction?

It does not conduct and nothing happens (D) Signup and view all the answers

What is the primary difference between the construction of an LED and a normal p-n junction diode?

The materials used for construction (D) Signup and view all the answers

What is the relationship between the brightness of an LED and the current drawn by it?

The brightness of the LED increases as the current drawn increases (B) Signup and view all the answers

What type of energy is released when electrons and holes recombine in the PN Junction of an LED?

Light energy (D) Signup and view all the answers

What is the primary reason why silicon or germanium is not used for constructing LEDs?

They emit energy in the form of heat (A) Signup and view all the answers

Which type of LED is commonly used in small appliances such as remote controls and calculators?

MINIATURE LED (A) Signup and view all the answers

What is the primary advantage of using RGB LEDs in various applications?

They can produce almost any color output (D) Signup and view all the answers

What is the primary function of the aluminum/ceramic body in LIGHTING LEDs?

To provide heat dissipation (B) Signup and view all the answers

Which type of LED is particularly useful for photographers who need continuous lighting for shooting stills?

BI-COLOR LED (D) Signup and view all the answers

What is the primary difference between high power LEDs and traditional indicator LEDs?

Their levels of light output (D) Signup and view all the answers

What type of applications are high power LEDs typically used for?

Industrial facilities, sports venues, and outdoor environments (B) Signup and view all the answers

In which mode does a Zener diode allow a large amount of electric current and blocks only a small amount of electric current?

Forward-biased mode (C) Signup and view all the answers

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

To protect the circuit from over voltage (A) Signup and view all the answers

In a diode checking process, what is observed in a good diode when it is forward-biased?

Meter pointer shows low resistance (A) Signup and view all the answers

What is the name of the region in which a Zener diode is designed to operate?

Zener breakdown region (A) Signup and view all the answers

In what type of devices are high power LEDs also used?

Vehicle-mounted spotlights, portable torches, and flashlights (B) Signup and view all the answers