Întrebare  |
Răspuns |
What was early capacitor used for? începe să înveți
|
|
The early capacitor (Leyden jar) was used to store static electric charge for experiments.
|
|
|
|
începe să înveți
|
|
A capacitor is a passive electronic component that stores electrical energy in an electric field.
|
|
|
What does capacitor consist of? începe să înveți
|
|
It consists of two conductive plates separated by an insulating material called a dielectric.
|
|
|
What happens when you connect your capacitor to the power supply? începe să înveți
|
|
When connected to a DC power supply, current flows momentarily, charging the capacitor until the voltage across it equals the supply voltage, at which point current stops.
|
|
|
What is the key property of a capacitor? începe să înveți
|
|
Its key property is capacitance, which is its ability to store electrical charge.
|
|
|
How can capacitance be denoted? începe să înveți
|
|
It is denoted by the letter 'C'.
|
|
|
What is the unit of measurement for capacitance? începe să înveți
|
|
|
|
|
What factors does capacitance depend on? începe să înveți
|
|
It depends on the surface area of the plates (A), the distance between them (d), and the dielectric constant (ε) of the insulating material. (C = εA/d)
|
|
|
What affects the behaviour of capacitors in a circuit? începe să înveți
|
|
The frequency of the applied voltage (AC vs. DC) and the circuit configuration.
|
|
|
How do capacitors behave in DC circuits? începe să înveți
|
|
They act as an open circuit (infinite resistance) once fully charged, blocking DC current.
|
|
|
How do capacitors behave in AC circuits? începe să înveți
|
|
They allow AC current to pass, but offer a frequency-dependent opposition called capacitive reactance.
|
|
|
How does relative permittivity affect capacitance? începe să înveți
|
|
A higher relative permittivity (dielectric constant) of the insulating material increases the capacitance.
|
|
|
Can you give the formula for calculating the energy stored in a capacitor? începe să înveți
|
|
The energy (E) is equal to one-half times the capacitance (C) times the voltage (V) squared.
|
|
|
What 3 effects of a capacitor in a circuit are mentioned in the video? începe să înveți
|
|
Coupling, Decoupling, Filtering, and Energy Storage.
|
|
|
How can capacitors protect sensitive electronic components? începe să înveți
|
|
As decoupling capacitors, they smooth out voltage spikes and provide a local reservoir of charge.
|
|
|
How can capacitors be used as filters? începe să înveți
|
|
They can block low-frequency signals (DC) while passing high-frequency signals (AC), or be used in combination with resistors/inductors to create specific frequency response circuits.
|
|
|
What types of capacitors are mentioned in the video? Where are they used? începe să înveți
|
|
Common types include ceramic (high-frequency circuits), electrolytic (power supply filtering, high capacitance), and film (precision applications).
|
|
|
