Question 2: What is resistance? Element resistance is an element that consumes electric energy and converts it into heat energy (such as electric heating wire) or light energy (such as tungsten wire of incandescent lamp).
Question 3: What is a resistive element? What is the nature of a hair dryer? Electric energy is converted into electric heating elements and resistance elements.
It is not completely converted into electric heat, and there is mechanical energy of rotation, so it is not. It is a resistor and a motor. It's over. Stand back.
Question 4: What are resistance, capacitance and inductance? Resistance is an energy-consuming element, and both AC and DC can pass through it. Capacitors are connected to AC and separated from DC. The higher the circuit frequency, the smaller the capacitive reactance. Pure capacitance does not consume energy. Inductance can pass through DC, but it is equal to short circuit for DC. For alternating current, the higher the frequency, the greater the inductance, and the pure inductance does not consume energy.
Question 5: What is resistance? What role does it play in the circuit? Resistance is one of the most widely used and commonly used electronic components in electronic circuits, which is usually referred to as resistance for short. Resistors are electronic components that control the current in a circuit. By controlling the current, the following purposes can be achieved: (1) Establish a suitable current operating point for the amplifier circuit; Establishing an appropriate voltage operating point for the amplifier circuit through voltage division; As a load resistor, an amplified signal is obtained from the amplifier circuit; Cooperating with the capacitor to obtain delay and timing control signals; It cooperates with the capacitor to form a differential or integral circuit to shape and transform the signal; And is matched with a capacitor to form a power filter circuit. Resistance can be divided into fixed resistance and variable resistance (or adjustable resistance) according to structure. Fixed resistance is a kind of resistance with fixed resistance, which can be divided into carbon film resistance, metal film resistance and wire wound resistance according to its composition materials. A variable resistor is a resistor whose resistance can be changed. According to its composition and structure, it can be divided into sliding adjustable resistor and potentiometer. In addition, there are some resistors with special functions and special uses, such as thermistors for detecting temperature and photoresistors for detecting illumination. These resistors can be called sensitive resistors and are not usually regarded as resistive elements.
Question 6: What is 6:RT? RT is a thermistor electronic component.
Thermistor is a kind of sensitive element, which can be divided into positive temperature coefficient thermistor (PTC) and negative temperature coefficient (NTC) according to different temperature coefficients. The typical feature of thermistor is that it is sensitive to temperature and shows different resistance values at different temperatures. Positive temperature coefficient thermistor (PTC) has higher resistance at higher temperature, while negative temperature coefficient (NTC) has lower resistance at higher temperature, which belongs to semiconductor devices.
Question 7: What are electronic components and what are their uses? Commonly used electronic components are: resistors, capacitors, inductors, potentiometers, transformers, diodes, triodes, mos transistors, integrated circuits, etc.
1. Resistance
The resistance of a conductor to current is called its resistance. Substances with low resistance are called electrical conductors, or conductors for short. 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, abbreviated as ohm, and the symbol is ω (Greek letter, transliteration is pinyin, and pronunciation is not u mg m). The larger units are kiloohm (kω) and megaohm (mω) (trillion = million, that is, 1 million).
2. Capacitance
Capacitance (or capacitance) is a physical quantity, which indicates the capacity of a 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 a discharge circuit, the self-discharge effect/electrolytic capacitance 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.
C=εS/4πkd=Q/U
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).
3. Inductance coefficient
Inductor is an element that can convert electric energy into magnetic energy and store it. The structure of inductor is similar to that of transformer, but there is only one winding. Inductor has a certain inductance, which only prevents the change of current. If the inductor is in a state where no current passes, it will try to stop the current from flowing through it when the circuit is connected; If the inductor is in a state of current flow, it will try to keep the current constant when the circuit is disconnected. Inductors are also called chokes, reactors and dynamic reactors.
4. Potentiometer
Potentiometer is a resistance element with three terminals, and its resistance value can be adjusted according to a certain change law. Potentiometers usually consist of resistors and movable brushes. When the brush moves along the resistor, the resistance value or voltage related to the displacement is obtained at the output end. Potentiometers can be used as both three-terminal elements and two-terminal elements. The latter can be regarded as a variable resistor.
Potentiometer is an adjustable electronic component. It consists of a resistor and a rotating or sliding system. When a voltage is applied between two fixed contacts of a resistor, the position of the contacts on the resistor can be changed by rotating or sliding the system, and a voltage related to the position of the moving contact can be obtained between the moving contact and the fixed contact. When the potentiometer is a four-terminal element, it is mainly used as a voltage divider. Potentiometer is basically a sliding rheostat, there are several styles, which are generally used to adjust the volume switch of the speaker and the power of the laser head.
5. Transformer
Transformer is a device that uses electromagnetic induction principle to change AC voltage. The main components are primary coil, secondary coil and iron core (magnetic core). The main functions are: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer) and so on.
Transformers are often used for boosting, impedance matching, safety isolation, etc.
6. Diodes
Diodes are electronic components with two electrodes, which only allow current to flow in one direction. Many uses are to apply its rectification function. And varactor (v >: >
Question 8: What is the thermistor NTC 10D/9 of this electronic component? Its application type: general resistor, manufacturing process type: ceramic insulated power type, characteristic type: inorganic solid resistor, structural form: disk type, lead type: radial lead, rated voltage: 600-1800 vac (v);