Capacitor Fundamentals Quiz Practice Quiz | AC/DC…

Q: In an AC circuit, what is the current's phase relationship with the voltage across a capacitor?

The current leads the voltage. — In an AC circuit, the current leads the voltage in a capacitor.

Q: What is the primary function of a capacitor in a DC circuit?

To block the current after it charges. — In a DC circuit, a capacitor initially charges and then acts like an open switch, blocking the flow of current.

Q: What is the SI unit of capacitance?

Farad — The SI unit of capacitance is the Farad (F).

Q: Which of the following materials is commonly used as a dielectric in capacitors?

Mica — Mica is a commonly used dielectric material.

Q: How are the plates of a capacitor separated?

By an insulator (dielectric) — The plates are separated by a dielectric material, which is an insulator.

Q: What is the formula for calculating capacitance (C)?

C = Q/V — Capacitance (C) is calculated by dividing the electric charge (Q) by the voltage (V).

Q: When capacitors are connected in series, what happens to the total capacitance?

It decreases. — When capacitors are connected in series, the total capacitance decreases.

Q: Which of the following is a key application of capacitors in AC circuits?

Power factor correction — Capacitors are commonly used for power factor correction in AC circuits.

Q: What is the role of a capacitor in a transformerless power supply?

To filter the DC voltage and regulate current — Capacitors can be used to filter DC voltage and regulate current in a transformerless power supply.

Q: Which of the following factors affects the capacitance of a capacitor?

All of the above — Plate's area, the gap between the plates, and the permittivity of the insulating material all affect capacitance.

Question 1 of 10

In an AC circuit, what is the current's phase relationship with the voltage across a capacitor?

In an AC circuit, the current leads the voltage in a capacitor.

Question 2 of 10

What is the primary function of a capacitor in a DC circuit?

In a DC circuit, a capacitor initially charges and then acts like an open switch, blocking the flow of current.

Question 3 of 10

What is the SI unit of capacitance?

The SI unit of capacitance is the Farad (F).

Question 4 of 10

Which of the following materials is commonly used as a dielectric in capacitors?

Mica is a commonly used dielectric material.

Question 5 of 10

How are the plates of a capacitor separated?

The plates are separated by a dielectric material, which is an insulator.

Question 6 of 10

What is the formula for calculating capacitance (C)?

Capacitance (C) is calculated by dividing the electric charge (Q) by the voltage (V).

Question 7 of 10

When capacitors are connected in series, what happens to the total capacitance?

When capacitors are connected in series, the total capacitance decreases.

Question 8 of 10

Which of the following is a key application of capacitors in AC circuits?

Capacitors are commonly used for power factor correction in AC circuits.

Question 9 of 10

What is the role of a capacitor in a transformerless power supply?

Capacitors can be used to filter DC voltage and regulate current in a transformerless power supply.

Question 10 of 10

Which of the following factors affects the capacitance of a capacitor?

Plate's area, the gap between the plates, and the permittivity of the insulating material all affect capacitance.

Capacitor Fundamentals Quiz