Is there any difference between a resistor and a variable resistor?

Resistor. The resistance value is fixed, and the variable resistance adjusts the resistance value at will. Its differences are:

Distinguish. 1. The variable resistor (wirewound structure) in the case of large power is very large, and the moving piece can slide left and right to adjust the resistance value.

Distinguish. 3. The variable resistor with a small plastic shell is smaller in size and has a circular structure, with three pins pointing down and the resistance adjustment port facing upward.

Distinguish. Fourth, there is an adjustment port on the variable resistor, with a flathead screwdriver.

Inserting it into this adjustment opening, you can change the position of the moving piece by turning the screwdriver and adjust the resistance value.

Distinguish. 6. Horizontal variable resistor is also used in small signal circuits, its three pins are 90 degrees from the resistor plane, vertically downward, and are installed horizontally on the road board, and the resistance adjustment port is facing up.

Distinguish. 7. Its nominal resistance value can be seen on the variable resistor, and this nominal resistance value refers to the resistance between the two fixed chip pins, and it is also the maximum resistance between a fixed chip pin and the moving chip pin.

Distinguish. 8. There are three pins in the variable resistor, these three pins are different, one is the moving piece pin, and the other two are the fixed chip pins, generally the two fixed chip pins can be used interchangeably, and the fixed chip and the moving film pins can not be used interchangeably.

One resistance value is unchanged, and one resistance value is adjustable.

Fixed resistors are mainly divided into carbon film anousers, metal film resistors, metal oxide film resistors, synthetic carbon film resistors, glass glaze resistors, cement resistors, row resistors, chip resistors, fuse resistors, fuses, etc.

A variable resistor is a resistor whose resistance can be changed arbitrarily, and the resistor has an adjustment part on the housing that allows the resistance to be adjusted manually.

The resistance value of the sensitive resistor changes with the change of the external environment, and can usually be identified according to the identification on the resistor shell, and the structure and function of different sensitive resistors will be different, and the common sensitive resistors mainly include thermistors, photoresistors, moisture resistors, gas sensitive resistors, varistors, etc. Among them, the constant thermistor does the best.

A fuse resistor is a resistor with a resistance equal to or close to zero ohms and has an overcurrent protection function.

The classification of resistors is also varied, and it is usually divided into three categories: fixed resistors, variable resistors, and special resistors. Classified by use:

Current limiting resistor, step-down resistor, voltage divider resistor, protection resistor, start-up resistor, sampling resistor, decoupling resistor, signal attenuation resistor, etc.; According to the shape and production materials, there are carbon film resistors, boron carbon film resistors, silicon carbon film resistors, synthetic film resistors, metal film resistors, oxide film resistors, solid (including organic and inorganic) resistors, varistors, photoresistors, thermistors, cement resistors, wire resistors, chip resistors and other types. aqui te amo。

There are many types of resistors, and if they are divided according to their working characteristics and their role in the circuit, they can be divided into fixed resistors and resistors.

There are two main categories of variable resistors. The resistor with a fixed resistance value is called a fixed resistor, and there are many kinds of fixed resistors, mainly.

There are carbon resistors, carbon film resistors, metal film resistors, wirewound resistors, etc. The resistance value is connected to an adjustable resistor within a certain range.

It is called a variable resistor or potentiometer. Variable resistors are generally adjustable at both ends, and potentiometers are generally adjustable at three ends.

According to the appearance and shape of the resistor, it is generally divided into cylindrical resistors, button resistors and chip resistors.

According to the different materials, resistors can be divided into wirewound resistors, film resistors, carbon resistors, etc.

According to different applications, resistors can be divided into precision resistors, high-frequency resistors, high-voltage resistors, high-power resistors, thermistors and fuse resistors.

If the lead wire is different, resistors can be divided into axial lead resistors, leadless resistors, etc.

Classification of resistors:

1. Wirewound resistors: general wirewound resistors, precision wirewound resistors, high-power wirewound resistors, high-frequency wirewound resistors.

2. Thin film resistors: carbon film resistors, synthetic carbon film resistors, metal film resistors, metal oxide film resistors, chemical deposition film resistors, glass glaze film resistors, metal nitriding film resistors.

3. Solid resistors: inorganic synthetic solid carbon resistors, organic synthetic solid carbon resistors.

4. Sensitive resistors: varistors, thermistors, photoresistors, force resistors, gas resistors, moisture resistors.

Resistors are the most basic electronic components, which can be divided into fixed resistors (resistors) and variable resistors in terms of resistance.

There are many types of resistors, such as platoons, cement resistors, potentiometers, and varistors.

Fixed resistors.

Variable resistors.

Sensitive resistors.

Resistors are generally referred to as resistors in daily life. It is a current limiting element, after the resistor is connected to the circuit, the resistance value of the resistor is fixed, generally two pins, which can limit the current through the branch it is connected to.

You are talking about a specific application, if it is used for voltage division, the resistance can be understood as resistive voltage, and if it is used for current limiting, the resistance can be understood as resisting current.

Sliding rheostats.

The resistance of the access circuit can be changed continuously by changing the number of turns of the resistance line of the access circuit (to be precise, the resistance of the resistance line of one turn is changed as the minimum change unit), and the resistance value of the connection fast incoming circuit cannot be read from the rheostat.

Variable value rheostat: also known as resistance box.

The resistance of the access circuit can be changed by changing the fixed resistance of the access circuit, and the resistance value of the access circuit can not be continuously changed, and the resistance value of the access circuit can be read from the scale on the surface of the resistance box.

Fixed-value resistor: a resistor with a fixed resistance value, and the general resistance value does not change after being connected to the circuit.

1. The obstruction effect of the conductor on the current is called the resistance of the conductor. Resistance (usually denoted by "r") is a physical quantity called spring, which in physics indicates the magnitude of a conductor's resistance to an electric current. The greater the resistance of a conductor, the greater the resistance of the conductor to the current.

Different conductors, the resistance is generally different, and resistance is a property of the conductor itself. The resistance of a conductor is usually represented by the letter r, and the unit of resistance is ohm.

2. Resistance is formed by the directional movement of free electrons by the current in a metal conductor. Free electrons collide frequently with metal cations in motion, and the number of collisions per second is as high as about 1015. This collision hinders the directional movement of free electrons, and the physical quantity that indicates this hindrance is called resistance.

Not only metal conductors have resistance, but other objects also have resistance. The resistance of a conductor is determined by its own physical conditions, and the resistance of a metal conductor is determined by its material properties, length, thickness (cross-sectional area), and service temperature.

3. The unit of resistance is ohms, referred to as ohms, which is represented by the Greek letter "". Commonly used units of resistance are kiloohms (k) and megaohms (m).

What is Resistor? To put it simply, resistance refers to the resistance encountered by the current in the circuit, or the obstruction of the current by the object. The greater the resistance, the greater the resistance to the current and therefore the lower the current.

Conversely, the smaller the resistance, the less resistance the current will be, and therefore the greater the current.

The symbol of the resistor is "r". The unit of resistance is ohms, referred to as ohms, and is represented by the letter "q".

Resistance is present in any object, and conductors are no exception. You may have this experience, when the rice cooker is cooking, the wire will heat up a little, the reason is that there is resistance in the copper that makes the wire, although the resistance is very small, but in the case of cooking rice in the case of high-current bending branches, it will still consume local electrical energy and distribute it in a hot way.

So is the resistor perfect? Of course not. It is because of the resistance that we are able to control the magnitude of the current. In order for the current to do the work according to people's wishes, resistors were created. After that, I will introduce you to what a resistor is.

Hello dear kiss, the pull-up resistor is not a variable electric hand breaker, the pull-up is to clamp the uncertain signal at a high level through a resistor, and the resistor strikes the silver and plays a current-limiting role at the same time. The same is true for pull-downs, which also clamp an uncertain signal low through a resistor. The pull-up is the input current of the device, and the pull-down is the output current; The strength is only the difference in the resistance of the pull-up resistor, and there is no strict distinction; For non-collector (or drain) open output circuits (such as ordinary gate circuits) that are limited in their ability to provide current and voltage, the function of the pull-up resistor is mainly to output the current channel for open collector output circuits.

On the wire to which the pull-up resistor is connected, if the external component is not enabled, the pull-up resistor "weakly" "pulls up" the input voltage signal.

Question 1: Is the resistor an electrical appliance? Please be more detailed?

Yes The concept of resistance: resistance, the hindrance effect of a substance on the current is called the pre-electrical resistance of the substance. Substances with low electrical resistance are called electrical conductors, or guide travelers for short.

Substances with high electrical resistance are called electrical insulators, or insulators for short. This shows that when the resistance = o, there is no electrical energy converted into heat energy loss, that is, there is no resistance The principle of action of electrical appliances is:

Converting electrical energy into other forms of energy So resistors are electrical appliances.

Question 2: Is a resistor equivalent to an electrical appliance? It is a drop, and the current passing through the resistor will produce heat (Ohm's law), which is a pure resistance electrical appliance, and the electric furnace is typical.

However, if the resistance is too large, the current is blocked, which is equivalent to a switch. Specific problems are analyzed on a case-by-case basis. In general, electrical appliances are used.

Question 3: Are all electrical appliances resistive Yes.

Question 4: Is the physical resistance of junior high school equivalent to electrical appliances? 20 points 1. Because the resistor consumes electrical energy when working, the resistance is equivalent to the electrical appliance.

2. If you add electrical appliances, the current becomes smaller. The reason is that the power supply voltage is unchanged, and the total resistance of the series circuit is equal to the sum of the resistances, and when we add electrical appliances, the total resistance increases, and according to Ohm's law i=u r, the resistance becomes larger and the current becomes smaller.

3. In series circuits, the resistor shares the voltage, and the larger the resistance, the greater the voltage shared.

If you don't understand, you can ask.

Question 5: The power of household appliances with high resistance is large or small, and whether it consumes more or less You confuse the two concepts of resistance and power, (pure resistance appliances, if water heaters, rice cookers) The greater the power of electrical appliances, the smaller the resistance, the greater the energy consumption, (inductance circuits, with motors) can not use resistance to say things, the greater the power, the greater the power consumption.

The difference between the two:

A variable resistor is a type of electrical resistanceIt can play the role of resistance in electronic circuits, and it differs from general resistance in that its resistance value can be continuously changed within a certain rangeA rheostat is a device that can adjust the size of the resistanceIt can be connected to the circuit to adjust the size of the current. Generally, a rheostat consists of a wire with a high resistance (resistance wire) and a device that can change the contact point to adjust the effective length of the resistance wire.

Variable resistance is very different from ordinary resistance in appearance, it has the following characteristics:

There are three pins in the variable resistor, these three pins are different, one is the moving piece pin, and the other two are the fixed chip pins, generally the two fixed pins can be used interchangeably, and the fixed chip and the moving film pins can not be used interchangeably.

There is an adjustment port on the variable resistor, which is inserted with a flathead screwdriver, and the position of the moving piece can be changed by turning the screwdriver, and the resistance value can be adjusted.

On the variable resistor, you can see its nominal resistance value, which refers to the resistance between the two fixed pins, and is also the maximum resistance between a fixed pin and the moving chip pin.

The function of the rheostat: 1. Limit the current and protect the circuit; 2. Change the distribution of voltage in the circuit.

Rheostat Applications:

a knob on the Walkman to adjust the volume level; a knob on a desk lamp to dim the light; A knob on a computer to adjust the brightness or dimming of the display; A knob that adjusts the temperature of the iron. are all rheostat applications.

The difference between a variable resistor and a rheostat is that a variable resistor generally has only two leads, and a rheostat generally has three leads.

There is no essential difference between a variable resistor and a rheostat. However, it is usually called a variable resistor in a circuit, and a rheostat is often used in physics and electrical laboratory classes. The former is smaller in size and is an element; The latter are larger, such as slip-wire resistors.

But there are no strict rules either. To put it simply, there is no big difference between the two.