physics 2

What is the Si unit of capacitance

Farad

Which of the following is NOT a use of capacitors?

Producing magnetic fields

In a capacitor, electrical energy is stored in the form of

Electric fields

The formula for capacitance is

C= Q/V

What happens to the capacitance when the plate area of a capacitor increases?

Increases

In a series circuit, the total capacitance is always

Less than the smallest capacitor

What is the role dielectric in a capacitor?

Increases capacitance

Capacitors in parallel have:

The same voltage across each capacitor

What is the primary purpose of a capacitor in an AC circuit?

Block DC and pass AC

What happens to capacitance if the distance between the plates increases?

Decreases

Why does capacitance decrease when capacitors are connected in series?

The effective separation between plates increases

In a parallel circuit, how does the total charge behave?

Increases as more capacitors are added

What would happen if a capacitor is removed from a series circuit?

The circuit will stop working

Which factor does NOT affect the capacitance of a capacitor?

Resistance of the circuit

If two capacitors of equal value are connected in parallel, how does the total

capacitance compare to a single capacitor?

Doubled

A capacitor is fully charged. What happens if the voltage supply is suddenly

removed?

The stored charge leaks away over time

What type of capacitor is commonly used in electronic timing circuits?

Variable capacito

Why do larger capacitors store more charge at the same voltage?

Larger plate area

How does a dielectric material affect a capacitor?

Increases capacitance

What is a practical use of capacitors in power supply circuits?

Voltage regulation

TYPES OF CAPACITORS

CERAMIC CAPACITORS, ELECTROLYTIC CAPACITORS, FILM CAPACITORS, SUPERCAPACITORS, MICA CAPACITORS, VARIABLE CAPACITORS

CERAMIC CAPACITORS

made from ceramic dielectric material, small size and low cost

with frequency response. Common use as signal filtering

ELECTROLYTIC CAPACITORS

uses as electrolyte to achieve a high capacitance value,

high capacitance, polarized (both positive and negative terminal). Common use as power supply

circuits.

FILM CAPACITORS

uses a plastic film as the dielectric , high reliability and low cost .

Common use as power electronics and motor run applications.

SUPERCAPACITORS

stores a large amount of charge using electrostatic and

electrochemical effects, extremely high capacitance and fast charge. Common use as energy

storage and back-up power

MICA CAPACITORS

uses mica as the dielectrics for precision applications. Common use

as radio-frequency and high precision circuits.

VARIABLE CAPACITORS

capacitance can be adjusted by changing the plate separation or

overlapping area. Common use as radio tuning circuits.