Various resistance symbols, what are the resistance symbols?

1. Color wheel recognition:

1) The first color wheel, the second color circle accordingly represents the first and second significant digits of the resistance value.

2) The third color wheel represents the number of '0' added after the first digit.

3) The fourth color ring represents the allowable error of the resistance value. Brown for 1%, red for 2%, gold for 5%, and silver for 10

For example: 15k resistor as shown in the image above.

The color wheel is: brown, green, black, red, brown, the first and second color wheels are significant figures, brown 1, green 5, representing the first two significant figures are 15, the third color circle black represents 0, and the fourth color circle is 'red 2'

The number of 0s. i.e. 15 0 00 = 15k, and the last brown color is the error factor of 1%.

2. The rated power of the resistor.

When an electric current flows through a resistor, the resistance heats up. The more power you have, the more you heat, and too much will burn out the resistor. The maximum power allowed for a resistor to work normally for a long time is called the rated power.

The power of the resistors is 1 8W (Watts), 1 4, 1 2, 1W, 2W, 3W, 4W, 5W, 10W, 100W, etc.

Resistance: The resistance of a conductor to an electric current is called resistance. Resistance symbol (r) unit name (ohm.

Unit Symbol (

Magnitude: r=u i r is independent of the voltage u at both ends of the conductor and the current i through the conductor.

Determinant: r = l s resistance r is determined by the material, length, cross-sectional area of the conductor, which is affected by temperature.

The single-phase inlet line shall not be less than 10.

Thermistor. RT Photoresistor RL Varistor RPS Ground Resistor RG Discharge Resistor RD Start Rheostat RS

Frequency-sensitive rheostat RF current-limiting rheostat RC

I'll just briefly introduce the resistor symbols that I've seen in various circuit diagrams

1. Ordinary resistance: The symbol is a very flat rectangle.

2. Sliding rheostat: the symbol is known to the landlord.

3. Fine-tuning resistance: The symbol is to draw a diagonal line on the symbol of ordinary resistance, and there is a ** at the upper end of the diagonal line, like a T-shape.

4. Adjustable resistance: The symbol is to draw an oblique arrow on the symbol of ordinary resistance.

I've only seen these four resistor symbols, and I don't know if there are others.

Sliding Rheostat: The physical diagram is a horizontal line with a downward arrow drawn in the middle.

The circuit diagram is a very flat rectangle with a downward arrow drawn on it, and the tail of the arrow is connected to the wire.

A rectangle with one end connected to a wire [usually].

Go there! You can find it.

The resistor symbol is .

The resistance of a conductor to the current is called the resistance of the conductor, and the resistance is a physical quantity, which indicates the magnitude of the conductor's resistance to the current in physics.

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 ohms, or ohms for short.

The symbol for resistance is the uppercase Greek letter " " which reads "Omega", but in electricity as a unit of resistance is read "Ohm".

As long as the Greek letter can be found, the 24th capital letter is it.

If you type this letter in a computer or mobile phone, it is best to use an input method that assists the "symbol" function, such as the Sogou input method, which has "Greek Latin" in the "symbol" to find the "".

The resistor is represented by "r", the unit is ohm, and the Greek letter " " is denoted by the rectangle, and the symbol in the circuit diagram is a rectangle.

The unit of resistance is ohm, referred to as ohm, and the symbol is .

Definition of Resistance: The resistance of a conductor to an electric current is called resistance. Different conductors have different conductivity, and the greater the obstruction to the current, the weaker the conductivity, and the greater the resistance. The reason why an insulator acts as an insulating is because of its high electrical resistance.

The resistance of a conductor is usually represented by the letter r, and the unit of resistance is ohm (ohm), or ohm for short, and the symbol is . The resistors are arranged in units from largest to smallest: m (megaohms), k (kiloohms), ohms), m (milliohms), microohms).

Resistance conversion relationship: 1k = 1000; 1mω=1000kω；1ω=1000mω；1mω=1000μω。

The factors that affect the resistance are as follows:

1. Resistance is the property of the conductor, and its size is only related to the material, length and slag area of the conductor, and has nothing to do with the voltage at both ends of the conductor and the current of the front beam through the conductor. For the same material, the longer the length, the smaller the cross-sectional area, and the greater the resistance.

2. The resistance of the conductor is also related to the temperature. In general, the resistance of a conductor increases with increasing temperature, such as a metal conductor; There are also a few conductors whose resistance decreases with increasing temperature, such as graphite.

Types and characteristics of resistors:

1. Carbon film resistor. Gaseous hydrocarbons decompose at high temperatures and in vacuum, and carbon is deposited on porcelain rods or tubes, forming a crystalline carbon film. Different resistance values can be obtained by changing the thickness of the carbon film and changing the length of the carbon film by notching.

Carbon film resistors have low cost and average performance.

2. Metal film resistance. The alloy is heated in a vacuum, and the alloy evaporates, forming a conductive metal film on the surface of the porcelain rod. Notching and changing the thickness of the metal film can control the resistance. Compared with carbon film resistors, this kind of resistor is smaller, lower noise, and better stability, but the cost is higher.

3. Carbon resistance. The mixture of carbon black, resin, clay and other materials is pressed into Huifeng and then made by heat treatment, and its resistance value is represented by a color ring on the resistor. This kind of resistor has a low cost and a wide range of resistance values, but its performance is poor and it is rarely used.

4. Wirewound resistance. It is made of constantan or nickel-chromium alloy resistance wire wound on a ceramic skeleton. This kind of resistance is divided into fixed and variable, it is characterized by stability, good heat resistance, small error range, suitable for high-power occasions, rated power is generally more than 1 watt.