What is a resistor, capacitance, inductor, and what are the commonly used resistors capacitance indu

Resistance The resistance of a conductor to an electric current is called the resistance of a conductor.

Capacitance A physical quantity that characterizes a capacitor's ability to hold an electric charge. We put the capacitor between the two pole plates.

The amount of electricity required to increase by 1 volt is called the capacitance of a capacitor.

Inductance In a circuit, when an electric current flows through a conductor, an electromagnetic field is generated, and the magnitude of the electromagnetic field is divided.

The magnitude of the current is the inductance.

The definition of inductance is l=phi i and the unit is Weber.

Resistance Definition: The resistance of a conductor to an electric current is called the resistance of a conductor.

Resistors are the most used components of all electronic circuits. The main physical characteristic of the resistor is that it transforms electrical energy into thermal energy, which can also be said to be an energy-dissipating element, and the internal energy is generated when the current passes through it. Resistors usually play the role of voltage divider shunt in circuits, and for signals, both AC and DC signals can pass through resistors.

Resistors all have a certain resistance value, which represents the amount of resistance to the current flow. The unit of resistance is ohms, which is denoted by the symbol " ". Ohm is defined like this:

When a voltage of 1 volt is applied to both ends of a resistor, if 1 ampere of current passes through the resistor, the resistor has a resistance of 1 ohm. In addition to ohms, the units of resistance include kiloohms (k), megaohms (m), etc.

Capacitance Capacitance is a physical quantity that characterizes a capacitor's ability to hold an electric charge. The capacitance of a capacitor is called the capacitance of a capacitor by increasing the potential difference between the two plates of a capacitor by 1 volt.

The symbol for capacitance is c. In the International System of Units, the unit of capacitance is farad, abbreviated as law, and the symbol is f. For a capacitor, if the potential difference between the two stages is 1 volt when there is a charge with 1 bank, the capacitance of this capacitor is 1 method.

Inductance In a circuit, when an electric current flows through a conductor, an electromagnetic field is generated, and the magnitude of the electromagnetic field divided by the magnitude of the current is the inductance, and the definition of inductance is l=phi i, and the unit is Weber.

Inductance is a physical quantity that measures the ability of a coil to generate electromagnetic induction. When an electric current is applied to a coil, a magnetic field is generated around the coil, and magnetic flux passes through the coil. The greater the power supply that goes through the coil, the stronger the magnetic field and the greater the magnetic flux through the coil.

Experiments have shown that the magnetic flux through the coil is proportional to the current passing through, and their ratio is called the self-inductance coefficient, also known as the inductance. If the magnetic flux through the coil is denoted by , the current is denoted by i, and the inductance is denoted by l, then.

l i inductance is measured in milligrams (h), but milligrams (mh) or micrograms (uh) are also commonly used as units. 1h=1000mh，1h=1000000uh。

The inductor can only act on unsteady currents, and it is characterized by the fact that the voltage at both ends is proportional to the instantaneous rate of change (derivative) of the current passing through it, and the proportionality coefficient is its "self-inductance".

The reason why the inductor works is that it produces a changing magnetic field when it passes through an unsteady current, and this magnetic field will in turn affect the current, so in this way, any conductor, as long as it passes through the unsteady current, will produce a changing magnetic field, which will in turn affect the current, so any conductor will have a self-inductance phenomenon.

You can see a lot of copper wire winding coils on the motherboard, this coil is called inductance, inductance is mainly divided into two kinds of magnetic inductance and hollow inductance, the magnetic inductance is large and commonly used in the filter circuit, the hollow inductor is small, and is often used in high-frequency circuits.

This problem is too big to be good. The capacitance is generally fixed, the common value is 1, the value of the inductance is generally wound according to the actual size of the need, but there are also good finished products, generally 10 integer multiples. There are many resistance values, and there are basically common values.

The difference is big, the function is different, the nature is different, and the circuit combination is different.

1. Inductance symbol: L, unit: h (hunt) Inductance unit: (ohm).

2. Capacitance symbol: c, unit: f (farad) capacitive reaction unit: (ohm).

3. Impedance symbol: z, unit: (ohm).

4. Admittance symbol: Y, unit: S (Ximen eggplant bush).

Definitional: <

However, the magnitude of the capacitance is not determined by q (charged) or U (voltage), i.e. the capacitance is determined by the following formula: c = s 4 kd.

where is a constant, s is the area facing the capacitive plate, d is the distance of the capacitive plate, and k is the electrostatic force constant. Common parallel plate capacitors, the capacitance is c = s d ( is the dielectric constant of the medium between the plates, s is the area of the plates, d is the distance between the plates).

The formula for calculating the potential energy of a capacitor is: e=cu2 2=qu 2=q2 2c

The formula for calculating the parallel connection of multiple capacitors: c=c1+c2+c3+....+cn

The formula for calculating multi-capacitor series in series: 1 c=1 c1+1 c2+....+1/cn

Three capacitors in series: c=(c1*c2*c3) (c1*c2+c2*c3+c1*c3).

Second, the impedance formula.

z= r+i( ωl–1/（ωc）)

Note: The load is a resistor, inductive inductance, capacitive reactance of three types of compounds, after the composite is collectively referred to as "impedance", written as a mathematical formula: impedance Z = r + i ( l 1 ( C)).

where r is the resistance, l is the inductive reactance, and 1 (c) is the capacitive resistance.

1) If (l 1 c) >0, it is called "inductive load";

2) Conversely, selling cherry blossoms if (l 1 c) <0 is called "capacitive load".