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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.
