Daily review: What is Diode? Construction & Working of PN Junction Diode | What is Ohm (?)? Unit of Electrical Resistance and Impedance | What is Electric Current, its Unit, Formula, Types & Applications Quiz

Q: What is the primary function of a PN junction diode?

To allow current to flow in only one direction — A PN junction diode acts as a one-way switch, allowing current to flow in forward bias and blocking it in reverse bias.

Q: What does an Ohm (?) represent in an electrical circuit?

The opposition to the flow of electric current — The Ohm is the SI unit of electrical resistance, measuring how much a component resists the flow of current.

Q: Which of the following is the standard formula to define Electric Current (I)?

I = Q / t — Electric current is defined as the rate of flow of electric charge (Q) through a cross-section per unit time (t).

Q: What happens at the 'depletion region' of a PN junction diode?

It is an area devoid of mobile charge carriers — The depletion region is created by the recombination of electrons and holes, leaving behind immobile ions and no free charge carriers.

Q: Which type of current periodically reverses its direction and changes its magnitude?

Alternating Current (AC) — Alternating Current (AC) flows back and forth in a circuit, unlike DC which flows in a single constant direction.

Q: What is the primary difference between Resistance and Impedance?

Resistance applies to DC, while Impedance applies to AC including reactive components — Resistance is purely real, while impedance is a complex quantity that accounts for resistance, inductance, and capacitance in AC circuits.

Q: What is the SI unit of Electric Current?

Ampere — The Ampere (A) is the base SI unit for measuring electric current.

Q: In a PN junction, what occurs when the diode is forward-biased?

The depletion region narrows and current flows — Forward bias reduces the potential barrier at the junction, narrowing the depletion region and allowing majority carriers to flow.

Q: Which of these is a typical application of an electric current?

All of the above — Electric current is utilized for heating, lighting, and mechanical motion (electromagnetic conversion) in various applications.

Q: If the resistance of a circuit is 10 Ohms and the current is 2 Amps, what is the voltage? (Using Ohm's Law V=IR)

20 Volts — According to Ohm's Law, V = I * R. Therefore, V = 2A * 10? = 20V.

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Question 1 of 10

What is the primary function of a PN junction diode?

A PN junction diode acts as a one-way switch, allowing current to flow in forward bias and blocking it in reverse bias.

Question 2 of 10

What does an Ohm (?) represent in an electrical circuit?

The Ohm is the SI unit of electrical resistance, measuring how much a component resists the flow of current.

Question 3 of 10

Which of the following is the standard formula to define Electric Current (I)?

Electric current is defined as the rate of flow of electric charge (Q) through a cross-section per unit time (t).

Question 4 of 10

What happens at the 'depletion region' of a PN junction diode?

The depletion region is created by the recombination of electrons and holes, leaving behind immobile ions and no free charge carriers.

Question 5 of 10

Which type of current periodically reverses its direction and changes its magnitude?

Alternating Current (AC) flows back and forth in a circuit, unlike DC which flows in a single constant direction.

Question 6 of 10

What is the primary difference between Resistance and Impedance?

Resistance is purely real, while impedance is a complex quantity that accounts for resistance, inductance, and capacitance in AC circuits.

Question 7 of 10

What is the SI unit of Electric Current?

The Ampere (A) is the base SI unit for measuring electric current.

Question 8 of 10

In a PN junction, what occurs when the diode is forward-biased?

Forward bias reduces the potential barrier at the junction, narrowing the depletion region and allowing majority carriers to flow.

Question 9 of 10

Which of these is a typical application of an electric current?

Electric current is utilized for heating, lighting, and mechanical motion (electromagnetic conversion) in various applications.

Question 10 of 10

If the resistance of a circuit is 10 Ohms and the current is 2 Amps, what is the voltage? (Using Ohm's Law V=IR)

According to Ohm's Law, V = I * R. Therefore, V = 2A * 10? = 20V.

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