Capacitance is a physical quantity, which indicates the capacity of capacitor to hold charge. The following property of a non-conductor is that when two opposite surfaces of the non-conductor maintain a certain potential difference (as in a capacitor), energy is stored in the non-conductor due to the movement of charges. Capacitance (or capacitance [4]) is a physical quantity, which indicates the capacity of capacitor to hold charge. We will increase the potential difference between the two plates of the capacitor by 1 volt, which is called the capacitance of the capacitor. Physically speaking, a capacitor is an electrostatic charge storage medium (just like a bucket, you can charge it). In the absence of discharge circuit, the self-discharge effect of eliminating dielectric leakage is obvious, and the charge may exist forever, which is its characteristic. It has a wide range of uses and is an indispensable electronic component in the fields of electronics and electric power. Mainly used in power supply filtering, signal filtering, signal coupling, resonance, DC isolation and other circuits.
The symbol of the capacitor is C.
In the international system of units, the unit of capacitance is farad, and the symbol is F. Commonly used capacitance units are millifarad (mF), microfarad (μF), nanofarad (nF) and picofarad (pF). The conversion relationship is as follows:
1 farad (F)= 1000 millifarad (MF) = 1000000 microfarad (μF)
1 microfabrication (μF)= 1000 nanofarads (nF)= 1000000 picofarads (pF).
The resistance of a conductor to current is called its resistance. (The picture on the right shows the JEPSUN patch resistance and the common color ring resistance respectively. A substance with low resistance is called an electrical conductor. Substances with high resistance are called electrical insulators, or insulators for short.
In physics, resistance is used to indicate the resistance of a conductor to current. The greater the resistance of a conductor, the greater the resistance of the conductor to current. Different conductors generally have different resistances, and resistance is the nature of the conductor itself.
The resistance of a conductor is usually represented by the letter R. The unit of resistance is ohm [1] (short for ohm), and the symbol is ω (Greek letter, transliteration is ω u m÷g m). The larger units are kiloohms (kω) and megaohms (mω) (trillion = million, that is, 1 million).
Referred to as resistor (usually represented by "R") is the most used component in all electronic circuits. The main physical feature of resistance is that the converted energy is thermal energy, or it can be said that it is an energy-consuming element, through which current generates internal energy. Resistors usually function as voltage divider and shunt in circuits. For signals, both AC and DC signals can pass through resistors.
K Ω (kiloohms) and M Ω (megaohms), their conversion relationship is:
1mω= 1000000ω 1kω= 1000ω
In physical calculation, the inductance is equivalent to a large resistance at the moment of power-on, and then to a very long straight wire (excluding resistance). It has the characteristics of AC DC resistance and high frequency and low frequency resistance.
The capacitor can be connected to alternating current, but not to direct current, and the voltage of the components connected in parallel with it is the same after being connected to the circuit. Pass AC, block DC, pass high frequency and resist low frequency.