What is the sliding rheostat symbol, what is the sliding rheostat symbol?

The symbol of the sliding rheostat is shown below

A sliding rheostat is a circuit element that can change its resistance to control the circuit. In circuit analysis, a sliding rheostat can be used either as a fixed-value resistor or as a variable-value resistor.

The composition of the sliding rheostat generally includes five parts: binding post, sliding vane, resistance wire, metal rod and porcelain cylinder. The resistance wire of the sliding rheostat is wound on an insulating porcelain cylinder, and the resistance wire is coated with an insulating varnish.

The sliding rheostat symbol is: <>

The material of the sliding rheostat resistance wire is generally a constantan wire or a nickel-chromium alloy.

Wire, the constantan wire or nichrome alloy wire is wound on the insulating cylinder, the two ends are led out with leads, and the sliding blade of the rheostat contacts the resistance wire and can be adjusted to the distance at both ends, so as to change the resistance of the metal rod to both ends of the resistance wire, which constitutes a sliding rheostat.

In addition, there is a sliding rheostat in which a resistive material (such as a carbonaceous material) is "plated" on an insulating substrate, and the resistance is adjusted by a sliding blade in the middle.

Sliding rheostat is one of the commonly used devices in electricity, and its working principle is to change the resistance by changing the length of the resistance line of the part of the access circuit, so as to gradually change the magnitude of the current in the circuit.

The resistance wire of the sliding rheostat is generally a nickel-chromium alloy with a high melting point and large resistance, and the metal rod is generally a metal with a small resistance, so when the resistance cross-sectional area is constant, the longer the resistance wire, the greater the resistance, and the shorter the resistance wire, the smaller the resistance.

There is also a kind of painting that does not know, and generally uses these two.

Do you know sliding rheostats?

It's in the eight science books.

Sliding rheostatsThe symbol is p, and the style is as follows:

The sliding rheostat can gradually change the resistance of the connected circuit, and play the role of segment cracking to continuously change the current magnitude, but it cannot accurately know the resistance value of the connected circuit. If you need to know the resistance value of the resistor connected to the circuit, you need to use a resistance box.

Therefore, the resistor box is a kind of rheostat that can adjust the resistance and can display the magnitude of the resistance value. It is compared to a sliding rheostat, which cannot represent the value of the resistance in and out of the connected circuit, but it can continuously change the resistance in the incoming circuit. The resistance box can represent the resistance value in and out of the circuit, but the resistance value change is not continuous.

The use of resistance boxes.

When using, connect the two binding posts to the circuit, and adjust the rotating disc to obtain an arbitrary resistance value between 0 nx (n x, n is the number of knobs holding the virtual closure). The indication of the corresponding indication point of each turntable is multiplied by the multiple marked on the face plate, and then added together, which is the resistance value of the access circuit.