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Questions and Answers
What is the main function of the Leyden jar?
What is the main function of the Leyden jar?
- To charge and discharge electrical energy (correct)
- To convert direct current to alternating current
- To act as a tunable frequency component
- To store energy in the form of a magnetic field
Which characteristic distinguishes a variable capacitor from a fixed capacitor?
Which characteristic distinguishes a variable capacitor from a fixed capacitor?
- It is more compact in size
- It can be adjusted to change capacitance (correct)
- It has a constant capacitance
- It is made exclusively of aluminum
What material is used as a dielectric in an electrolytic capacitor?
What material is used as a dielectric in an electrolytic capacitor?
- Glass
- Plastic
- Oil
- Aluminum oxide (correct)
In what application are fixed capacitors typically used?
In what application are fixed capacitors typically used?
What component is essential for discharging a Leyden jar?
What component is essential for discharging a Leyden jar?
Flashcards
Leyden Jar
Leyden Jar
A type of capacitor that consists of two metal sheets coated on the inside and outside of a glass vessel. It can be charged with a battery and discharged by connecting a wire to the knob and outer coating.
Fixed Capacitor
Fixed Capacitor
A capacitor with a fixed capacitance. It is used in applications where a specific, unchanging capacitance is needed.
Variable Capacitor
Variable Capacitor
A capacitor whose capacitance can be adjusted by changing the effective area of overlap of two sets of plates.
Electrolytic Capacitor
Electrolytic Capacitor
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What is a capacitor?
What is a capacitor?
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Study Notes
Types of Capacitors
- Known capacitor types include Leyden jar, fixed capacitor, variable capacitor, and electrolytic capacitor.
Leyden Jar
- Composed of two metal sheets coated, one inside and the other outside of a glass container.
- The inner metal is connected to a knob and rod.
- Can be charged using a battery.
- Discharged by connecting a wire to the knob and the outer coating.
Fixed Capacitor
- Compact capacitors with a fixed capacitance.
- Used for applications requiring a defined capacitance.
- Advantages include affordability and low capacitance rating.
Variable Capacitor
- Adjustable capacitance.
- Achieved by altering the overlap area of semicircular plates (often brass or aluminum).
- Separated by air or oil acting as a dielectric.
- Used in tuning circuits.
Electrolytic Capacitor
- Similar to fixed capacitors.
- Consists of two aluminum foil sheets.
- Sheets are separated by muslin soaked in ammonium borate solution.
- Rolled into an insulated case.
- When connected to a DC source, a thin aluminum oxide layer forms on the anode.
- This formed oxide layer acts as a dielectric.
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