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The process of causing a charged capacitor to lose charge (release charge and electrical energy) is called discharge
The process of causing a charged capacitor to lose charge (release charge and electrical energy) is called discharge. For example, use a wire to connect the two poles of a capacitor, and the charges on the two poles neutralize each other, and the capacitor will release charge and electric energy. After discharge, the electric field between the two plates of the capacitor disappears and the electrical energy is converted into other forms of energy.
In general electronic circuits, capacitors are commonly used to achieve bypass, coupling, filtering, oscillation, phase shift, and waveform transformation, which are the evolution of their charging and discharging functions.
The role of the capacitor in the circuit: In the DC circuit, the capacitor is equivalent to the open circuit. A capacitor is a component that can store electric charge and is one of the most commonly used electronic components.
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The process of charging a capacitor (storing charge and electrical energy) is called charging
The process of charging a capacitor (storing charge and electrical energy) is called charging. At this time, the two plates of the capacitor are always positively charged, and the other plate is negatively charged by the same amount. One plate of the capacitor is connected to the positive pole of the power supply (such as a battery pack), and the other plate is connected to the negative pole of the power supply, and the two plates are respectively charged with the same amount of dissimilar charges. After charging, there is an electric field between the two plates of the capacitor, and the charging process stores the electrical energy obtained from the power supply in the capacitor.
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A capacitor is composed of two electrodes and a dielectric material between them.
A capacitor consists of two electrodes and a dielectric material between them. Dielectric material is a kind of dielectric. When placed in the electric field between two parallel plates with equal amount of opposite charge, polarization charge is generated on the surface of the medium due to polarization, so that the charge bound on the plates increases accordingly, maintaining the potential difference between the plates unchanged. This is why the capacitor has a capacitive characteristic. The amount of electricity Q stored in the capacitor is equal to the product of the capacitance C and the potential difference U between the electrodes. The capacitance is proportional to the plate area and the dielectric constant ε of the dielectric material, and inversely proportional to the thickness of the dielectric material (I. e., the distance between the plates).
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Matters needing attention in the application of film capacitors
Application of film capacitors need to pay attention to the following matters:
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Analysis of the role of film capacitors, which are used in what areas
Film capacitors are used in what areas
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Reasons for starting capacitor burnout
Single-phase motors with slightly larger power are generally equipped with two capacitors, namely, starting appliances and running capacitors. Before 70 years, single-phase motors were mostly started by a capacitor. After the motor is started, the capacitor is thrown off by the centrifugal switch, and only the main winding works at this time. The secondary winding is idle.
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Application of capacitor
One of the common applications of a capacitor used as a filter capacitor is to use it as a filter capacitor in an electronic circuit to remove the high-frequency component of the AC signal and leave the DC component of the AC signal.
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Classification of capacitors
Capacitors are divided into solid capacitors, liquid capacitors and gas capacitors according to the nature of the dielectric.
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Working principle of capacitor
When the electric field intensity becomes larger, the charge storage capacity also becomes larger, and the quantity representing the electric field intensity is the electric field intensity E of the capacitor.
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Basic concepts of capacitors
The capacitor is separated and insulated by two conductor plates. The two conductor plates are respectively connected to the two ends of the power supply. The air gap in the middle is called the dielectric of the capacitor.
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